soc: qcom: Fix checks for QMI response values

The return values from QMI could be compared directly and was
incorrectly interpreted in service locator and notifier.

Also initialize structure in service locator so as to not have garbage
values in them.

Change-Id: I7f8f27857706e9508b64289d9263c79494c17a8d
Signed-off-by: Puja Gupta <pujag@codeaurora.org>