drm/radeon/kms: rs400/480 should set common registers.

These GPUs should be setting these registers up also.
Signed-off-by: NDave Airlie <airlied@redhat.com>

drivers/gpu/drm/radeon/rs400.c

@@ -390,6 +390,8 @@ static int rs400_startup(struct radeon_device *rdev)
 {
 	int r;
 
+	r100_set_common_regs(rdev);
+
 	rs400_mc_program(rdev);
 	/* Resume clock */
 	r300_clock_startup(rdev);