Crypto changes for devices that don't write ext4 fs on wipe

This adds a new function to libcutils, partition_wiped().
This is used to determine if a partition is wiped.

Change-Id: Ibb388976c6b5bd3923b62d8f79b2b97748abf6c1
diff --git a/libcutils/Android.mk b/libcutils/Android.mk
index 3b8cbbb..8ee4c9a 100644
--- a/libcutils/Android.mk
+++ b/libcutils/Android.mk
@@ -110,7 +110,7 @@
 # ========================================================
 include $(CLEAR_VARS)
 LOCAL_MODULE := libcutils
-LOCAL_SRC_FILES := $(commonSources) ashmem-dev.c mq.c android_reboot.c uevent.c
+LOCAL_SRC_FILES := $(commonSources) ashmem-dev.c mq.c android_reboot.c partition_utils.c uevent.c
 
 ifeq ($(TARGET_ARCH),arm)
 LOCAL_SRC_FILES += arch-arm/memset32.S