ANDROID: Switch CONFIG_QCOM_PDC CONFIG_QCOM_SCM and CONFIG_ARM_SMMU to be loaded as modules

To switch the QCOM_SCM driver to be loaded from a module,
we need to also switch QCOM_PDC and QCOM_ARM_SMMU to also
load from a module.

Bug: 153049053
Signed-off-by: John Stultz <john.stultz@linaro.org>
Change-Id: I0509628322b20dea5f7e16e973d93d369c0c2bff
[joneslee: Removed defconfig elements]
[joneslee: Removed init/Kconfig.gki elements]
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Matthias Maennich <maennich@google.com>