Service for reading and writing blocks to PST partition

Permits apps with permission
android.permission.ACCESS_PERSISTENT_PARTITION to obtain
a read and write data blocks to the PST partition.

Only one block ever exists at one time in PST. When
a client writes another block, the previous one is
overwritten.

This permits storing a block of data that will live
across factory resets.

Change-Id: I8f23df3531f3c0512118eb4b7530eff8a8e81c83
diff --git a/core/res/AndroidManifest.xml b/core/res/AndroidManifest.xml
index 59399d2..e38fce9 100644
--- a/core/res/AndroidManifest.xml
+++ b/core/res/AndroidManifest.xml
@@ -1075,6 +1075,13 @@
     <permission android:name="android.permission.TV_INPUT_HARDWARE"
         android:protectionLevel="signatureOrSystem" />
 
+    <!-- @hide Allows enabling/disabling OEM unlock
+   <p>Not for use by third-party applications. -->
+    <permission android:name="android.permission.OEM_UNLOCK_STATE"
+                android:permissionGroup="android.permission-group.SYSTEM_TOOLS"
+                android:protectionLevel="signature" />
+
+
     <!-- =========================================== -->
     <!-- Permissions associated with audio capture -->
     <!-- =========================================== -->