drm/amdgpu: make amd_asic_type.h self-contained

Include <linux/types.h> for u8.
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/115327b880b69b1c8ad157e5ff7f6b419868fab0.1709749576.git.jani.nikula@intel.com

include/drm/amd_asic_type.h

@@ -22,6 +22,9 @@
 
 #ifndef __AMD_ASIC_TYPE_H__
 #define __AMD_ASIC_TYPE_H__
+
+#include <linux/types.h>
+
 /*
  * Supported ASIC types
  */