refactor(ras): rename sdei related functions/events

Function to report sdei event was named on the basis of serror which has
caused that error. SError can be used in many cases and SDEI is one of
its usecases.
Make SDEI related names explicit.

Signed-off-by: Manish Pandey <manish.pandey2@arm.com>
Change-Id: I451008a7e5bfa34d8c4e8fb3c0c59b90c4bb7e5f
2 files changed