soc: qcom: ipcc: Add snapshot of IPCC controller

This is a snapshot of the IPCC controller driver as of msm-4.19 commit
<d3d6e9be4297471f88c2a14d31424c508a5b7174>. (Merge "cnss2: Add idle state
to bus voting").

Change-Id: I5b8a3b1e7f71d7cd7e59cf0271e8eac7549c5b6c
Signed-off-by: Prakruthi Deepak Heragu <pheragu@codeaurora.org>