uboot-fritz4040: build FritzBox 7520 variant

Support was added as variant of 7530 (DEVICE_ALT0_*) in:
cb6f4be1 "ipq40xx: add support for FRITZ!Box 7520"

u-boot has a distinct config for it [0], built it.

[0] https://github.com/chunkeey/FritzBox-4040-UBOOT/pull/6

Signed-off-by: Andre Heider <[email protected]>
Tested-by: Martin Blumenstingl <[email protected]>

package/boot/uboot-fritz4040/Makefile

@@ -41,6 +41,11 @@ define U-Boot/fritz4040
   BUILD_DEVICES:=avm_fritzbox-4040
 endef
 
+define U-Boot/fritz7520
+  NAME:=FritzBox 7520
+  BUILD_DEVICES:=avm_fritzbox-7530
+endef
+
 define U-Boot/fritz7530
   NAME:=FritzBox 7530
   BUILD_DEVICES:=avm_fritzbox-7530
@@ -72,6 +77,6 @@ define Package/u-boot/install
 	$(INSTALL_BIN) $(PKG_BUILD_DIR)/upload-to-f4040.sh $(1)/
 endef
 
-UBOOT_TARGETS := fritz1200 fritz3000 fritz4040 fritz7530
+UBOOT_TARGETS := fritz1200 fritz3000 fritz4040 fritz7520 fritz7530
 
 $(eval $(call BuildPackage/U-Boot))