kernel: bump 6.12 to 6.12.53

kernel: bump 6.12 to 6.12.53

Changelog: https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.53

Dropped patch
- /target/linux/generic/backport-6.12/541-v6.18-ksmbd-add-max-ip-connections-parameter.patch
merged upstream with commit https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-6.12.y&id=8173dcfafe116adb08f8daf21c09c71ac5882d8f

Added backport
- target/linux/generic/backport-6.12/510-v6.18-ksmbd-fix-recursive-locking-in-RPC-handle-list-access.patch
cherry picked from https://github.com/torvalds/linux/commit/88f170814fea74911ceab798a43cbd7c5599bed4

All other patches automatically rebased.

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>