staging rtl8192e: Declare MODULE_FIRMWARE usage

Cc: Larry Finger <Larry.Finger@lwfinger.net>
Cc: Mike McCormack <mikem@ring3k.org>
Cc: wlanfae <wlanfae@realtek.com>
Cc: Sean MacLennan <seanm@seanm.ca>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Acked-by: Sean MacLennan <seanm@seanm.ca>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>