Initial RCS CL.

This CL adds RcsManager with a dummy API.

Test: build
Bug: 109759350
Merged-in: Ib10a38fac9182ca010d3895431e419f5c1958d59
Change-Id: Ib10a38fac9182ca010d3895431e419f5c1958d59
(cherry picked from commit 7d496bc0308f202ffca4f5e4985421c329795cb4)
3 files changed