kernel: update fb package on x86 for kernel 6.12

kernel: update fb package on x86 for kernel 6.12

For kernel 6.12 the fb package uses video-common.ko instead of fbdev.ko.
The patch switches these files depending on the kernel version.

Ref:
 - https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-6.12.y&id=2fd001cd36005846caa6456fff1008c6f5bae9d4
 - https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-6.12.y&id=34cda5ab89d4f30bc8d8f8d28980a7b8c68db6ec

Signed-off-by: Mieczyslaw Nalewaj <namiltd@yahoo.com>
Link: https://github.com/openwrt/openwrt/pull/16547
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>