vbox_x86: add a 256M ext4 cache partition

Change-Id: If88895f60308673526a579a96d5b1ed9206c0241
Signed-off-by: Iliyan Malchev <malchev@google.com>
diff --git a/target/board/vbox_x86/BoardConfig.mk b/target/board/vbox_x86/BoardConfig.mk
index c2adac3..dc0f19e 100644
--- a/target/board/vbox_x86/BoardConfig.mk
+++ b/target/board/vbox_x86/BoardConfig.mk
@@ -13,6 +13,8 @@
 TARGET_CPU_ABI := x86
 TARGET_USERIMAGES_USE_EXT4 := true
 TARGET_BOOTIMAGE_USE_EXT2 := true
+BOARD_CACHEIMAGE_PARTITION_SIZE := 268435456
+BOARD_CACHEIMAGE_FILE_SYSTEM_TYPE := ext4
 
 # For VirtualBox and likely other emulators
 BOARD_INSTALLER_CMDLINE := init=/init console=ttyS0 console=tty0 vga=788 verbose