linux-firmware: add firmware for MT7622

Add binary firmware for MT7622 built-in Wi-Fi SoC.
Signed-off-by: Shayne Chen <shayne.chen@mediatek.com>
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Josh Boyer <jwboyer@kernel.org>

WHENCE

@@ -4483,6 +4483,17 @@ Licence: Redistributable. See LICENCE.mediatek for details.
 
 --------------------------------------------------------------------------
 
+Driver: mt7622 - MediaTek MT7622 Wireless MACs
+
+File: mediatek/mt7622_n9.bin
+Version: 20200131
+File: mediatek/mt7622_rom_patch.bin
+Version: 20190114
+
+Licence: Redistributable. See LICENCE.mediatek for details.
+
+--------------------------------------------------------------------------
+
 Driver: nfp - Netronome Flow Processor
 
 Link: netronome/nic_AMDA0081-0001_1x40.nffw -> nic/nic_AMDA0081-0001_1x40.nffw