kernel: bump 6.12 to 6.12.55

kernel: bump 6.12 to 6.12.55

Changelog: https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.55

Removed upstreamed:
	generic/backport-6.12/510-v6.18-ksmbd-fix-recursive-locking-in-RPC-handle-list-access.patch[1]

All other patches automatically rebased.

1. https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.12.55&id=4602b8cee1481dbb896182e5cb1e8cf12910e9e7

Build system: x86/64
Build-tested: x86/64-glibc
Run-tested: x86/64-glibc

Signed-off-by: John Audia <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/20515
Signed-off-by: Hauke Mehrtens <[email protected]>