soc: qcom: Add trace points for tracking

Currently scm_call_start and scm_call_end traces
are not called in proper location for scm_call2 api,
as there is no need to track retry of scm_calls.
Also add scm_call tracing in scm_call2_atomic API too.

Change-Id: I158a59b3ca6bc8bd7fe52a6fbb779d1614cc26b7
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>