kernel: bump 5.15 to 5.15.147

kernel: bump 5.15 to 5.15.147

Changelog: https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.147

Manually rebased:
	generic/backport-5.15/005-v5.17-01-Kbuild-use-Wdeclaration-after-statement.patch

All other patches automatically rebased.

Build system: x86_64
Build-tested: ramips/tplink_archer-a6-v3
Run-tested: ramips/tplink_archer-a6-v3

Signed-off-by: John Audia <therealgraysky@proton.me>
(cherry picked from commit 389135501565a6544775e0c75828a11e536e64a2)
[Refresh on top of OpenWrt 23.05]
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>