drm/msm: COMPILE_TEST support

With a simple stub, we can get COMPILE_TEST support.
Signed-off-by: Rob Clark <robdclark@gmail.com>

drivers/gpu/drm/msm/Kconfig

@@ -2,8 +2,7 @@
 config DRM_MSM
 	tristate "MSM DRM"
 	depends on DRM
-	depends on ARCH_MSM
-	depends on ARCH_MSM8960
+	depends on (ARCH_MSM && ARCH_MSM8960) || (ARM && COMPILE_TEST)
 	select DRM_KMS_HELPER
 	select SHMEM
 	select TMPFS

drivers/gpu/drm/msm/mdp4/mdp4_dtv_encoder.c

@@ -15,8 +15,6 @@
  * this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <mach/clk.h>
-
 #include "mdp4_kms.h"
 
 #include "drm_crtc.h"

drivers/gpu/drm/msm/msm_drv.h

@@ -31,6 +31,15 @@
 #include <linux/types.h>
 #include <asm/sizes.h>
 
+
+#if defined(CONFIG_COMPILE_TEST) && !defined(CONFIG_ARCH_MSM)
+/* stubs we need for compile-test: */
+static inline struct device *msm_iommu_get_ctx(const char *ctx_name)
+{
+	return NULL;
+}
+#endif
+
 #ifndef CONFIG_OF
 #include <mach/board.h>
 #include <mach/socinfo.h>