linux-lenovo-21bx: upgrade to 6.10

This isn't ready to merge yet, I want to wait until the 6.10 kernel has been released before merging. Submitting this now as a draft MR helps others test pre-merge (using mrtest add 5306)

pmOS changelog:

• kconfig rebased onto jhovold's defconfig (many things are now modules, but also includes initial camera support and other things)