x86-64: Allow fbdev primary video code

For some reason the 64-bit tree was doing this differently and
I can't see why it would need to.

This correct behaviour when you have two GPUs plugged in and
32-bit put the console in one place and 64-bit in another.

Signed-off-by: Dave Airlie <airlied@redhat.com>
LKML-Reference: <1262847894-27498-1-git-send-email-airlied@gmail.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>