linux-firmware: add firmware for MT7921

Add binary firmware for MT7921 based devices

File: mediatek/WIFI_MT7961_patch_mcu_1_2_hdr.bin
Version: 20210122002654a
File: mediatek/WIFI_RAM_CODE_MT7961_1.bin
Version: 20210122002730
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Josh Boyer <jwboyer@kernel.org>

WHENCE

@@ -4891,6 +4891,17 @@ Version: 20200819
 
 Licence: Redistributable. See LICENCE.mediatek for details.
 
+--------------------------------------------------------------------------
+
+Driver: mt7921 - MediaTek MT7921 Wireless MACs
+
+File: mediatek/WIFI_MT7961_patch_mcu_1_2_hdr.bin
+Version: 20210122002654a
+File: mediatek/WIFI_RAM_CODE_MT7961_1.bin
+Version: 20210122002730
+
+Licence: Redistributable. See LICENCE.mediatek for details.
+
 --------------------------------------------------------------------------
 Driver: nfp - Netronome Flow Processor