powerpc: kgdb: Remove OUTBUFMAX constant

This constant was introduced in commit 17ce452 ("kgdb, powerpc:
arch specific powerpc kgdb support"), but it is no longer used anywhere
in the source tree.

Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250915141808.146695-1-mikisabate@gmail.com

Author: mssola

arch/powerpc/include/asm/kgdb.h

@@ -25,7 +25,6 @@
 
 #define BREAK_INSTR_SIZE	4
 #define BUFMAX			((NUMREGBYTES * 2) + 512)
-#define OUTBUFMAX		((NUMREGBYTES * 2) + 512)
 
 #define BREAK_INSTR		0x7d821008	/* twge r2, r2 */