uboot-airoha: drop HIDDEN option

Drop HIDDEN option from U-Boot default for Airoha while support for ATF
gets pushed.

Signed-off-by: Christian Marangi <[email protected]>

package/boot/uboot-airoha/Makefile

@@ -13,7 +13,6 @@ include $(INCLUDE_DIR)/host-build.mk
 
 define U-Boot/Default
   BUILD_TARGET:=airoha
-  HIDDEN:=1
   FIP_COMPRESS:=1
 endef