Merge tag 'v4.9-next-kconfig' of https://github.com/mbgg/linux-mediatek into next/soc

- clean up mach-mediatek Makefile as kbuild only descends into the folder if
  ARCH_MEDIATEK is enabled

* tag 'v4.9-next-kconfig' of https://github.com/mbgg/linux-mediatek

:
  ARM: mediatek: clean up mach-mediatek/Makefile

Signed-off-by: Olof Johansson <olof@lixom.net>