msm: scm: Add logging of actual return code from scm call

When an error occurs during an scm call the error returned is
remapped so we lose the original error code. This means that
when an error occurs we have no idea what actually failed within
the secure environment.

Add a logging statement that will log the actual error code from
scm call allowing us to easier determine what caused the error
to occur.

Change-Id: I8439cf53e324fee136b78c1f9e55c4f3d54679eb
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>