linux-firmware: realtek: add RTL8812AU/RTL8821AU firmware

This adds firmware support for the RTL8812AU/RTL8821AU USB wireless adapters.

Signed-off-by: Marty Jones <mj8263788@gmail.com>
Link: openwrt/openwrt#17079
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

Author: mj22226

package/firmware/linux-firmware/realtek.mk

@@ -140,6 +140,20 @@ define Package/rtl8761bu-firmware/install
 endef
 $(eval $(call BuildPackage,rtl8761bu-firmware))
 
+Package/rtl8812a-firmware = $(call Package/firmware-default,RealTek RTL8812AU firmware)
+define Package/rtl8812a-firmware/install
+	$(INSTALL_DIR) $(1)/lib/firmware/rtw88
+	$(INSTALL_DATA) $(PKG_BUILD_DIR)/rtw88/rtw8812a_fw.bin $(1)/lib/firmware/rtw88
+endef
+$(eval $(call BuildPackage,rtl8812a-firmware))
+
+Package/rtl8821a-firmware = $(call Package/firmware-default,RealTek RTL8821AU firmware)
+define Package/rtl8821a-firmware/install
+	$(INSTALL_DIR) $(1)/lib/firmware/rtw88
+	$(INSTALL_DATA) $(PKG_BUILD_DIR)/rtw88/rtw8821a_fw.bin $(1)/lib/firmware/rtw88
+endef
+$(eval $(call BuildPackage,rtl8821a-firmware))
+
 Package/rtl8821ae-firmware = $(call Package/firmware-default,RealTek RTL8821AE firmware,,LICENCE.rtlwifi_firmware.txt)
 define Package/rtl8821ae-firmware/install
 	$(INSTALL_DIR) $(1)/lib/firmware/rtlwifi