drm/amd/amdgpu: add print prefix for dev_* variants

Define dev_fmt macro for informative print messages
Signed-off-by: Aurabindo Pillai <mail@aurabindo.in>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu.h

@@ -34,6 +34,12 @@
 
 #define pr_fmt(fmt) "amdgpu: " fmt
 
+#ifdef dev_fmt
+#undef dev_fmt
+#endif
+
+#define dev_fmt(fmt) "amdgpu: " fmt
+
 #include "amdgpu_ctx.h"
 
 #include <linux/atomic.h>