kernel: bump 6.12 to 6.12.44

kernel: bump 6.12 to 6.12.44

Changelog: https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.44

Removed upstreamed:
  generic-backport/220-v6.16-powerpc-boot-fix-build-with-gcc-15.patch[1]
  imx/patches-6.12/506-pending-PCI-imx6-Remove-apps_reset-toggle-in-_core_reset-function.patch[2]

All other patches automatically rebased.

1. https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.12.44&id=e42ac65e257b875614dd8f435b026a3e379e92e6
2. https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.12.44&id=90fa5884bc8f52cbf493492e32978c723c85e6ab

Build system: x86/64 (Intel N150 based)
Build-tested: flogic/gl.inet-gl-mt6000, flogic/xiaomi_redmi-router-ax6000-ubootmod, ramips/tplink_archer-a6-v3, x86/64-glibc
Run-tested: flogic/gl.inet-gl-mt6000, flogic/xiaomi_redmi-router-ax6000-ubootmod, ramips/tplink_archer-a6-v3, x86/64-glibc

Signed-off-by: John Audia <therealgraysky@proton.me>
Link: https://github.com/openwrt/openwrt/pull/19892
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>