kernel: modules: define fb-io-fops module

kernel: modules: define fb-io-fops module

Define define fb-io-fops module - Fbdev helpers for framebuffers in I/O memory
By creating a hidden module it is possible to load fb_io_fops.ko
according to the kernel version.

Fixes: 5048c9d ("kernel: modules: adjust the object files of kmod-fb ")
Package kmod-drm-radeon is missing dependencies for the following libraries:
fb_io_fops.ko
make[2]: *** [modules/video.mk:620: /__w/openwrt/openwrt/openwrt/bin/targets/x86/geode/packages/kmod-drm-radeon-6.12.28-r1.apk] Error 1
time: package/kernel/linux/compile#45.35#40.01#75.34

Signed-off-by: Mieczyslaw Nalewaj <namiltd@yahoo.com>
Link: https://github.com/openwrt/openwrt/pull/18771
Signed-off-by: Robert Marko <robimarko@gmail.com>