drm/amdgpu: use front door firmware loading for navi12

Same as other navi asics.
Signed-off-by: Xiaojie Yuan <xiaojie.yuan@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.c

@@ -362,6 +362,7 @@ amdgpu_ucode_get_load_type(struct amdgpu_device *adev, int load_type)
 	case CHIP_VEGA20:
 	case CHIP_NAVI10:
 	case CHIP_NAVI14:
+	case CHIP_NAVI12:
 		if (!load_type)
 			return AMDGPU_FW_LOAD_DIRECT;
 		else