hdmi: cec: add permission name to dump permission denial message

The android.security.cts.ServicePermissionsTest--testDumpProtected test was
failing on this service because it is looking for the permission name in the
denial message.

Change-Id: I4b4d38cd27b782470d1f21e36104164d2c8962a3
Signed-off-by: Adam Hampson <ahampson@google.com>