firmware: add firmware package for Realtek RTL8188FU

Realtek RTL8188F is an 802.11n 1x1 USB Wi-Fi adapter. It has been
supported by the upstream rtl8xxxu driver since Linux 6.2 kernel.

Signed-off-by: Shiji Yang <[email protected]>

package/firmware/linux-firmware/realtek.mk

@@ -29,6 +29,15 @@ define Package/rtl8188eu-firmware/install
 endef
 $(eval $(call BuildPackage,rtl8188eu-firmware))
 
+Package/rtl8188fu-firmware = $(call Package/firmware-default,RealTek RTL8188FU firmware)
+define Package/rtl8188fu-firmware/install
+	$(INSTALL_DIR) $(1)/lib/firmware/rtlwifi
+	$(CP) \
+		$(PKG_BUILD_DIR)/rtlwifi/rtl8188fufw.bin \
+		$(1)/lib/firmware/rtlwifi
+endef
+$(eval $(call BuildPackage,rtl8188fu-firmware))
+
 Package/rtl8192ce-firmware = $(call Package/firmware-default,RealTek RTL8192CE firmware)
 define Package/rtl8192ce-firmware/install
 	$(INSTALL_DIR) $(1)/lib/firmware/rtlwifi