soc: qcom: Free qmi handle in a worker thread

This change on arrival of ssr event schdule a worker thread,
which when run carry out task of qmi handle destruction.
It is a desired change to make ssr notification callback as
light as possible and avoid blocking it for long in corner cases.

Change-Id: I832fabce7569b1b8b966b7c49cda1b00cff2c472
Signed-off-by: Avaneesh Kumar Dwivedi <akdwived@codeaurora.org>