[heos] Fix bridge player channels

[jlaur]

This fixes an issue with creating dynamic channels for a channel type that doesn't exist. It is not created dynamically using ChannelTypeBuilder and it's not defined statically in the XML either. This leads to warnings like this:

[WARN ] [core.thing.internal.ThingManagerImpl] - Failed to normalize configuration for new thing during update 'heos:bridge:denon': {thing/channel=Type description heos:chPlayer for heos:bridge:denon:Pdenon not found, although we checked the presence before.}

and the dynamic channels not being added to the bridge thing at all. It seems this goes all the way back to #6099.

[lsiepel]

Thanks, LGTM