abl: feat: add extraargs from armbianEnv for mkbootimg

[CodeChenL]

Description

Add extraargs from armbianENV.txt to the cmdline option for mkbootimg

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please also note any relevant details for your test configuration.

• After applying this modification and reinstalling the kernel：

chen@xiaomi-elish:~$ cat /boot/armbianEnv.txt 
abl_boot_partition_label=boot_b
rootdev=UUID=940c68fe-1909-4918-9f8a-198b1582f0b2
rootfstype=ext4
extraargs=cpufreq.default_governor=schedutil
usbstoragequirks=0x2537:0x1066:u,0x2537:0x1068:u
chen@xiaomi-elish:~$ cat /proc/cmdline 
root=UUID=0552a964-89db-4af3-ade9-5f49d671df7e slot_suffix=_b cpufreq.default_governor=schedutil androidboot.verifiedbootstate=orange androidboot.keymaster=1 androidboot.vbmeta.device=PARTUUID=cd1cfbb7-7a7f-9f61-e1dc-df3128bdbcc9 androidboot.vbmeta.avb_version=1.0 androidboot.vbmeta.device_state=unlocked androidboot.vbmeta.hash_alg=sha256 androidboot.vbmeta.size=7872 androidboot.vbmeta.digest=05846afbe0b8ecc7023969e198f2b8b5822adb9573514e81abf0341964144c7f androidboot.vbmeta.invalidate_on_error=yes androidboot.veritymode=enforcing androidboot.bootdevice=1d84000.ufshc androidboot.fstab_suffix=default androidboot.boot_devices=soc/1d84000.ufshc androidboot.serialno=c1a6c19b androidboot.secureboot=1 androidboot.hwversion=C.9.0 androidboot.cpuid=0x3c53066a androidboot.hwc=CN androidboot.hwlevel=MP androidboot.baseband=apq msm_drm.dsi_display0=qcom,mdss_dsi_k81_42_02_0a_dual_cphy_video: androidboot.oled_wp=858286 androidboot.force_normal_boot=1 androidboot.ramdump=disable block2mtd.block2mtd=/dev/block/sda15,2097152 mtdoops.mtddev=0 mtdoops.record_size=2097152 mtdoops.dump_oops=0 printk.always_kmsg_dump=1 androidboot.dp=0x0 androidboot.cert=M2105K81AC

Checklist:

Please delete options that are not relevant.

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

Summary by CodeRabbit

• Chores
  • Updated kernel boot parameter configurations for OnePlus Kebab and Xiaomi Elish device models.

[coderabbitai]

📝 Walkthrough

Walkthrough

The changes consistently append the ${extraargs} variable to existing kernel boot command line arguments across three boot-related configuration files, while preserving all prior arguments.

Changes

Cohort / File(s)	Summary
Boot Command Line Enhancement extensions/image-output-abl.sh, packages/bsp/oneplus-kebab/zz-update-abl-kernel, packages/bsp/xiaomi-elish/zz-update-abl-kernel	Appended ${extraargs} variable to kernel boot command line arguments in mkbootimg and boot image construction, enabling additional kernel parameters to be passed through while preserving existing arguments like slot_suffix and root=UUID.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 Hop hop, the extraargs now align,
Three boot commands in perfect line,
From shell to kebab, to elish's glow,
Extra parameters steal the show! ✨

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: adding support for extraargs from armbianEnv to mkbootimg command line across multiple boot files.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[github-actions]

✅ This PR has been reviewed and approved — all set for merge!