Allow small size AFBC buffers to be allocated

Fix: 175107246
Test: 480p videoplayback
Change-Id: I30a2012ed1e33de7936cab02ed2a10ab45351325
diff --git a/gralloc3/src/Android.mk b/gralloc3/src/Android.mk
index b2c42df..ef1d12e 100644
--- a/gralloc3/src/Android.mk
+++ b/gralloc3/src/Android.mk
@@ -106,8 +106,8 @@
 endif
 
 # Minimum buffer dimensions in pixels when buffer will use AFBC
-GRALLOC_DISP_W?=1080
-GRALLOC_DISP_H?=1920
+GRALLOC_DISP_W?=0
+GRALLOC_DISP_H?=0
 GRALLOC_AFBC_MIN_SIZE?=75
 
 ifdef BOARD_GRALLOC_AFBC_DISP_W