rtlwifi: de-dupe rtl8723b WiFi firmware

The rtl8723bs and rtl8723bu WiFi firmware are identical according
to sha256sum are identical so lets remove the dupes and link them.

Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
CC: Larry Finger <Larry.Finger@lwfinger.net>
CC: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Josh Boyer <jwboyer@kernel.org>

WHENCE

@@ -3182,9 +3182,9 @@ Driver: rtl8723bs - Realtek 802.11n WLAN driver for RTL8723BS
 Info: Firmware files extracted from data statements in Realtek driver
       v4.3.5.5_12290.20140916_BTCOEX20140507-4E40.
 File: rtlwifi/rtl8723bs_bt.bin
-File: rtlwifi/rtl8723bs_nic.bin
-File: rtlwifi/rtl8723bs_ap_wowlan.bin
-File: rtlwifi/rtl8723bs_wowlan.bin
+Link: rtlwifi/rtl8723bs_nic.bin -> rtl8723bu_nic.bin
+Link: rtlwifi/rtl8723bs_ap_wowlan.bin -> rtl8723bu_ap_wowlan.bin
+Link: rtlwifi/rtl8723bs_wowlan.bin -> rtl8723bu_wowlan.bin
 
 Licence: Redistributable. See LICENCE.rtlwifi_firmware.txt for details.