arm64: defconfig: Enable Actions Semi specific drivers

Since the Actions Semi platform has been enabled in defconfig, let's
also enable the relevant device drivers there.

Link: https://lore.kernel.org/r/20200114084348.25659-3-manivannan.sadhasivam@linaro.org
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Olof Johansson <olof@lixom.net>