Update pmem/hw3d/mdp headers

Signed-off-by: Dima Zavin <dima@android.com>
diff --git a/libc/kernel/common/linux/msm_mdp.h b/libc/kernel/common/linux/msm_mdp.h
index 43fdac3..240b754 100644
--- a/libc/kernel/common/linux/msm_mdp.h
+++ b/libc/kernel/common/linux/msm_mdp.h
@@ -30,6 +30,7 @@
  MDP_Y_CBCR_H2V1,
  MDP_RGBA_8888,
  MDP_BGRA_8888,
+ MDP_RGBX_8888,
  MDP_IMGTYPE_LIMIT
 };
 
@@ -81,3 +82,4 @@
 };
 
 #endif
+