use x86_64's system image size

- build broken due to increased binary sizes
- x86_64's image size increased in separate CL.

bug: 35719262
Test: build

Change-Id: I8763e97f92e78e7136a65542e14124a607c28b9a
diff --git a/BoardConfig.mk b/BoardConfig.mk
index 6e2bbfd..d006028 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -14,11 +14,3 @@
 # 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 := 786432000
-BOARD_USERDATAIMAGE_PARTITION_SIZE := 576716800
-BOARD_CACHEIMAGE_PARTITION_SIZE := 69206016
-BOARD_CACHEIMAGE_FILE_SYSTEM_TYPE := ext4
-BOARD_FLASH_BLOCK_SIZE := 512
-TARGET_USERIMAGES_SPARSE_EXT_DISABLED := true
-