openthread-br: bump source version to 2024-11-20 and add missing dependencies
Bumping ot-br-posix that openthread-br is based on to latest code.
Due to some major changes required some more compilation flags, and in order to avoid the ot-br agent had to add some dependencies as well
Dependecies:
1. kmod-tun: otherwise the otbr fails to load and crashed immidiedtly
Compilation flags:
1. OTBR_NAT64, OT_NAT64_BORDER_ROUTING set to OFF: a temporary workaround to a compilation problem with openwrt, could be reverted once the issue here is fixed: openthread/ot-br-posix#2606
2. OT_TARGET_OPENWRT: wasn't assumed from OTBR_OPENWRT in some targets
Signed-off-by: Itay Shoshani <itai.sho@gmail.com>