Add support for RGBA_8888 pixel format

Change-Id: Ia15d49e51cad5bc8a3291975e1ff515a2b1c419c
diff --git a/minui/graphics_overlay.cpp b/minui/graphics_overlay.cpp
index 2ba452a..978a3bb 100644
--- a/minui/graphics_overlay.cpp
+++ b/minui/graphics_overlay.cpp
@@ -82,6 +82,8 @@
     int format = MDP_RGB_565;
 #if defined(RECOVERY_BGRA)
     format = MDP_BGRA_8888;
+#elif defined(RECOVERY_RGBA)
+    format = MDP_RGBA_8888;
 #elif defined(RECOVERY_RGBX)
     format = MDP_RGBA_8888;
 #endif