rtl_bt: Add rtl8761b firmware

From Realtek 20200806_LINUX_BT_DRIVER_RTL8761B_COEX_v0202
driver package

Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@infinera.com>
Signed-off-by: Josh Boyer <jwboyer@kernel.org>

WHENCE

@@ -3760,6 +3760,8 @@ File: rtl_bt/rtl8723bs_fw.bin
 File: rtl_bt/rtl8723bs_config-OBDA8723.bin
 Link: rtl_bt/rtl8723bs_config-OBDA0623.bin -> rtl8723bs_config-OBDA8723.bin
 File: rtl_bt/rtl8761a_fw.bin
+File: rtl_bt/rtl8761b_fw.bin
+File: rtl_bt/rtl8761b_config.bin
 File: rtl_bt/rtl8812ae_fw.bin
 File: rtl_bt/rtl8821a_fw.bin
 Link: rtl_bt/rtl8821a_config.bin -> rtl8821c_config.bin
@@ -3789,6 +3791,9 @@ File rtl_bt/rtl8822cu_fw.bin came directly from Realtek.
 updated on October 23, 2019
 File rtl_bt/rtl8822cu_config.bin came directly from Realtek.
 
+Found in vendor driver, 20200806_LINUX_BT_DRIVER_RTL8761B_COEX_v0202.zip
+File rtl_bt/rtl8761b_fw.bin
+File rtl_bt/rtl8761b_config.bin
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 Driver: btmtk_usb - Bluetooth USB driver