soc: qcom: smd-rpm: Add existing platform support

This patch adds support for all current Qualcomm platforms which utilize
RPM over SMD.  This includes both MSM8916 and APQ8084.

Reviewed-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: Andy Gross <agross@codeaurora.org>