kernel: bump 6.12 to 6.12.54

kernel: bump 6.12 to 6.12.54

Changelog: https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.54

Manually rebased:
	bcm27xx/patches-6.12/950-0018-arm64-setup-Fix-build-warning.patch

All other patches automatically rebased.

Build system: x86/64
Build-tested: flogic/xiaomi_redmi-router-ax6000-ubootmod, ramips/tplink_archer-a6-v3, x86/64-glibc
Run-tested: flogic/xiaomi_redmi-router-ax6000-ubootmod, ramips/tplink_archer-a6-v3, x86/64-glibc

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

Signed-off-by: John Audia <therealgraysky@proton.me>
Build system: x86/64
Build-tested: mediatek/filogic
Run-tested: mediatek/filogic

Signed-off-by: Edoardo Pinci <epinci@outlook.com>
Link: https://github.com/openwrt/openwrt/pull/20408
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>