kernel: bump 5.15 to 5.15.124

kernel: bump 5.15 to 5.15.124

Changelog: https://lore.kernel.org/stable/2023080341-curliness-salary-4158@gregkh/

1. Needed to make a change to to package/kernel/linux/modules/netsupport.mk
   due to upstream moving vxlan to its own directory[1].  @john-tho suggested
   using the the 6.1 xvlan FILES to circumvent.
2. All patches automatically rebased.

1. https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.15.124&id=77396fa9096abdbfbb87d63e73ad44d5621cf103

Signed-off-by: John Audia <therealgraysky@proton.me>
[Refreshed on top of OpenWrt 23.05]
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
(cherry picked from commit 81c1172c3626157ff9a146430cd14e32c9c80a5a)