ARM: qcom_defconfig: Enable ARM SMMU

Enable ARM SMMU driver for using with platforms like SDX55.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20210118053853.56224-9-manivannan.sadhasivam@linaro.org


Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>