implement dimming with a texture on msm7k so it uses copybit
diff --git a/libs/surfaceflinger/Android.mk b/libs/surfaceflinger/Android.mk
index 16936e3..29b88e9 100644
--- a/libs/surfaceflinger/Android.mk
+++ b/libs/surfaceflinger/Android.mk
@@ -21,6 +21,10 @@
 LOCAL_CFLAGS:= -DLOG_TAG=\"SurfaceFlinger\"
 LOCAL_CFLAGS += -DGL_GLEXT_PROTOTYPES -DEGL_EGLEXT_PROTOTYPES
 
+ifeq ($(TARGET_BOARD_PLATFORM), msm7k)
+	LOCAL_CFLAGS += -DDIM_WITH_TEXTURE
+endif
+
 # need "-lrt" on Linux simulator to pick up clock_gettime
 ifeq ($(TARGET_SIMULATOR),true)
 	ifeq ($(HOST_OS),linux)