Change default fbo cache size to 0

 Bug: 17479800

 FBO cache is very expensive and no longer necessary, disable
 it by just setting size to 0.

Change-Id: I664616f262c8339919e1d20baaafa5de2b628d7e
diff --git a/libs/hwui/Properties.h b/libs/hwui/Properties.h
index feaee8e..7eb9a32 100644
--- a/libs/hwui/Properties.h
+++ b/libs/hwui/Properties.h
@@ -227,7 +227,7 @@
 #define DEFAULT_PATCH_CACHE_SIZE 128 // in kB
 #define DEFAULT_GRADIENT_CACHE_SIZE 0.5f
 #define DEFAULT_DROP_SHADOW_CACHE_SIZE 2.0f
-#define DEFAULT_FBO_CACHE_SIZE 16
+#define DEFAULT_FBO_CACHE_SIZE 0
 
 #define DEFAULT_TEXTURE_CACHE_FLUSH_RATE 0.6f