drm: remove `const` attribute to hint at caller that they now own the memory

Signed-off-by: Eric Engestrom <eric.engestrom@imgtec.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
index 981ca3f..a89c480 100644
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -1154,7 +1154,7 @@
 	u32 tmp, viewport_w, viewport_h;
 	int r;
 	bool bypass_lut = false;
-	const char *format_name;
+	char *format_name;
 
 	/* no fb bound */
 	if (!atomic && !crtc->primary->fb) {
@@ -1471,7 +1471,7 @@
 	u32 viewport_w, viewport_h;
 	int r;
 	bool bypass_lut = false;
-	const char *format_name;
+	char *format_name;
 
 	/* no fb bound */
 	if (!atomic && !crtc->primary->fb) {