rtlwifi: rtl8723ae: Fix typo in firmware names

commit 73e088ed17c2880a963cc760a78af8a06d4a4d9d upstream.

The driver loads its firmware from files rtlwifi/rtl8723fw*.bin, but the
MODULE_FIRMWARE macros refer to rtlwifi/RTL8723aefw*.bin.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Reported-by: Axel Köllhofer <AxelKoellhofer@web.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>