linux-firmware: Add Realtek Bluetooth HCD firmware

By uploading these firmware files to the Realtek Bluetooth HCD
(on the USB bus), the HCD becomes compliant with standard btusb
interfaces. The code to automatically upload the firmware has
been already upstreamed and it is currently in linux-next.
Signed-off-by: Daniel Drake <drake@endlessm.com>
Signed-off-by: Kyle McMartin <kyle@kernel.org>

WHENCE

@@ -2477,6 +2477,19 @@ Version: STP2_D0_1417_04_patch_15.1
 
 Licence: Redistributable. See LICENCE.ibt_firmware for details
 
+File: rtl_bt/rtl8192ee_fw.bin
+File: rtl_bt/rtl8192eu_fw.bin
+File: rtl_bt/rtl8723a_fw.bin
+File: rtl_bt/rtl8723b_fw.bin
+File: rtl_bt/rtl8761a_fw.bin
+File: rtl_bt/rtl8812ae_fw.bin
+File: rtl_bt/rtl8821a_fw.bin
+
+Licence: Redistributable. See LICENCE.rtlwifi_firmware.txt for details.
+
+Found in vendor driver, linux_bt_usb_2.11.20140423_8723be.rar
+From https://github.com/troy-tan/driver_store
+
 --------------------------------------------------------------------------
 
 Driver: btmtk_usb - Bluetooth USB driver