kernel: bump 6.18 to 6.18.23

kernel: bump 6.18 to 6.18.23

Changelog: https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.18.23

Removed upstreamed:
  generic/pending-6.18/360-Revert-MIPS-mm-kmalloc-tlb_vpn-array-to-avoid-stack-.patch[1,2]
  generic/pending-6.18/361-Revert-MIPS-mm-Prevent-a-TLB-shutdown-on-initial-uni.patch[3]

All other patches automatically rebased via update_kernel.sh

Upstream fixed booting the RealTek MIPS 4KEc SoCs. The reverts are not
needed any more.

1. https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.18.23&id=ccc6a2241a49f68d8656ab1e10df377acfe2c5b4
2. https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.18.23&id=6c600fc0e99180c7a1b91c93e359009be8b4cfc2
3. https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.18.23&id=d8b281165a86041bb40e055eb79f735826d0df1b

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

Signed-off-by: John Audia <therealgraysky@proton.me>
Link: https://github.com/openwrt/openwrt/pull/22890
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>