firmware: Add support for Aeonsemi AS21xxx firmware

Add support for Aeonsemi AS21xxx firmware blob. Firmware has been
submitted and accepted to linux-firmware. Current version is 1.8.2.

Link: https://github.com/openwrt/openwrt/pull/19816
Signed-off-by: Christian Marangi <[email protected]>

package/firmware/linux-firmware/aeonsemi.mk

@@ -0,0 +1,9 @@
+Package/aeonsemi-as21xxx-firmware = $(call Package/firmware-default,Aeonsemi AS21xxx Ethernet PHY firmware,,LICENSE.aeonsemi)
+define Package/aeonsemi-as21xxx-firmware/install
+	$(INSTALL_DIR) $(1)/lib/firmware/aeonsemi
+	$(CP) \
+		$(PKG_BUILD_DIR)/aeonsemi/as21x1x_fw.bin \
+		$(1)/lib/firmware
+endef
+
+$(eval $(call BuildPackage,aeonsemi-as21xxx-firmware))