uboot-imx6: drop 'HIDDEN' flag from 'mx6cuboxi' define

Signed-off-by: Piotr Dymacz <[email protected]>

package/boot/uboot-imx6/Makefile

@@ -32,7 +32,6 @@ define U-Boot/mx6cuboxi
   UBOOT_IMAGE:=SPL u-boot.img
   UBOOT_MAKE_FLAGS:=SPL u-boot.img
   BUILD_DEVICES:=cubox-i
-  HIDDEN:=1
 endef
 
 define U-Boot/wandboard