drm/radeon/kms/atom: fix crtc lock ordering

This makes crtc_prepare and crtc_commit match.
Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

drivers/gpu/drm/radeon/atombios_crtc.c

@@ -782,8 +782,8 @@ static bool atombios_crtc_mode_fixup(struct drm_crtc *crtc,
 
 static void atombios_crtc_prepare(struct drm_crtc *crtc)
 {
-	atombios_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);
 	atombios_lock_crtc(crtc, 1);
+	atombios_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);
 }
 
 static void atombios_crtc_commit(struct drm_crtc *crtc)