x86: remove rogue default m in drivers/video/Kconfig

Remove rogue default m in drivers/video/Kconfig

default m is near always wrong, like here. For some reason ACPI
likes to reintroduce these and I like to immediately squash them again
before they pollute too many .configs.

Cc: len.brown@intel.com
Cc: luming.yu@gmail.com
Acked-by: Len Brown <len.brown@intel.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>