module/scmi_perf: Remove fast channel alarm id from scmi perf config.

The transport layer based fast channel implemetation does not require
the alarm in the scmi perf module anymore. So, it has been removed
from the code base.

Signed-off-by: Md Golam Tanvir Zim <mdgolamtanvir.zim@arm.com>
Change-Id: I4740dca9dd16d4e2708774b1f631e67c10b84590