drm/radeon: Move r100_*_*reg out of line

This shrinks the sizes of a lot of functions in the radeon driver
dramatically.

With a non force inline + -Os kernel this is default anyways.

Cc: David Airlie <airlied@linux.ie>

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>