arm-trusted-firmware-mediatek: set HIDDEN=y

Hide arm-trusted-firmware-mediatek packages from interactive config.
Exposing them only causes confusion and needed variants are anyway
selected as dependencies by uboot-mediatek packages.

Signed-off-by: Daniel Golle <[email protected]>

package/boot/arm-trusted-firmware-mediatek/Makefile

@@ -26,6 +26,7 @@ include $(INCLUDE_DIR)/package.mk
 define Trusted-Firmware-A/Default
   BUILD_TARGET:=mediatek
   TFA_IMAGE:=bl2.img bl31.bin
+  HIDDEN:=y
   BOOT_DEVICE:=
   DDR3_FLYBY:=
   DDR_TYPE:=