Add contextmount_type attribute to types used for context= mounts.

Change-Id: I09e13839b1956f61875a38844fe4fc3c911ea60f
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
diff --git a/sepolicy/file.te b/sepolicy/file.te
index 1ef4695..e75cc43 100644
--- a/sepolicy/file.te
+++ b/sepolicy/file.te
@@ -1,5 +1,5 @@
 # Default type for anything under /firmware
-type firmware_file, fs_type;
+type firmware_file, fs_type, contextmount_type;
 
 type qmuxd_socket, file_type;
 type sensors_socket, file_type;