mvebu arm64 for 4.18 (part 1)

Adding thermal for Armada 7K/8K and SPI for Armada 3700

* tag 'mvebu-arm64-4.18-1' of git://git.infradead.org/linux-mvebu:
  arm64: defconfig: enable the Armada thermal driver
  arm64: defconfig: enable CONFIG_SPI_ARMADA_3700
Signed-off-by: Olof Johansson <olof@lixom.net>