module/scmi_perf: Implement per-domain fast-channels

The current transport based fast channel implementation is platform
wide, instead of per domain as specified by the SCMI spec. This patch
implements the fast channel in per domain. Unit tests are modified
accordingly.

Signed-off-by: Md Golam Tanvir Zim <mdgolamtanvir.zim@arm.com>
Change-Id: Ifb6d80356c0227910b03f56e71157988141b196c