Remove deprecated strings

Removed the deprecated strings and brought back the permission strings
that were actually used.

Change-Id: Ie63a948522f7e11e1950969be5dfb26d7bc58e0a
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 29395c9..1b62f02 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -65,8 +65,8 @@
         android:name="com.android.email.permission.READ_ATTACHMENT"
         android:permissionGroup="android.permission-group.MESSAGES"
         android:protectionLevel="dangerous"
-        android:label="@string/read_attachment_label"
-        android:description="@string/read_attachment_desc"/>
+        android:label="@string/permission_read_attachment_label"
+        android:description="@string/permission_read_attachment_desc"/>
     <uses-permission
         android:name="com.android.email.permission.READ_ATTACHMENT"/>