switch to ext4

Change-Id: I490f0d9f72b1d9e29de1e9628d4483fbf1875347
diff --git a/BoardConfig.mk b/BoardConfig.mk
index 9236c4c..2a5fca2 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -13,3 +13,11 @@
 # share the same one across all mini-emulators
 BOARD_EGL_CFG := device/generic/goldfish/opengl/system/egl/egl.cfg
 
+TARGET_USERIMAGES_USE_EXT4 := true
+BOARD_SYSTEMIMAGE_PARTITION_SIZE := 576716800
+BOARD_USERDATAIMAGE_PARTITION_SIZE := 209715200
+BOARD_CACHEIMAGE_PARTITION_SIZE := 69206016
+BOARD_CACHEIMAGE_FILE_SYSTEM_TYPE := ext4
+BOARD_FLASH_BLOCK_SIZE := 512
+TARGET_USERIMAGES_SPARSE_EXT_DISABLED := true
+