SEAndroid Policy changes for HW based disk encryption

HW based disk encryption depends upon qseecom and module request
operation from kernel. Adding permission for VOLD for smooth
functionality of HW based disk encryption.

Change-Id: If938f1be1067ac14d5d2f685902643c5d580d94e
diff --git a/Android.mk b/Android.mk
new file mode 100644
index 0000000..6d6af7a
--- /dev/null
+++ b/Android.mk
@@ -0,0 +1,8 @@
+# Board specific SELinux policy variable definitions
+BOARD_SEPOLICY_DIRS := \
+       device/qcom/sepolicy
+
+BOARD_SEPOLICY_UNION := \
+       file_contexts \
+       device.te \
+       vold.te