video: kconfig: Drop the superfluous dependency

PCI is always selected by X86 architecture hence "X86 && PCI" does
not make it better.

Signed-off-by: Bin Meng <bmeng@tinylab.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>  # qemu-x86_64