linux-firmware: add firmware for MT7981

This patch adds firmware files v211120221208 for MT7981 WiFi.

Signed-off-by: Shayne Chen <shayne.chen@mediatek.com>
Signed-off-by: Josh Boyer <jwboyer@kernel.org>

WHENCE

@@ -5310,7 +5310,7 @@ Licence: Redistributable. See LICENCE.mediatek for details.
 
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-Driver: mt7915e - MediaTek Wireless MACs for MT7915/MT7916/MT7986
+Driver: mt7915e - MediaTek Wireless MACs for MT7915/MT7916/MT7986/MT7981
 
 File: mediatek/mt7915_wm.bin
 Version: 20220929104145
@@ -5355,6 +5355,13 @@ Version: 20211115
 File: mediatek/mt7986_eeprom_mt7975_dual.bin
 Version: 20220208
 
+File: mediatek/mt7981_wm.bin
+Version: 20221208201806
+File: mediatek/mt7981_wa.bin
+Version: 20221208202048
+File: mediatek/mt7981_rom_patch.bin
+Version: 20221208201745a
+
 Licence: Redistributable. See LICENCE.mediatek for details.
 
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