refactor(lib/smc): Move RMI and RSI header into `smc` component

This patch moves the RMI and RSI smc headers into the lib/smc folder.
This prepares the code base for a series of cleanups to the header
files.

Signed-off-by: Soby Mathew <soby.mathew@arm.com>
Change-Id: I4878913b339d75f58169842aa3227eef0bb039bc
2 files changed