drivers: memshare: Defer Memshare QMI service initialization

QMI service is initialized from the module init funtion and might be
initialized before some of the underlying layers of QMI stack. This might
lead to random bootup failures.

Defer the QMI service initialization by scheduling it in a workqueue.

Change-Id: Ie45e21c900f36df62b06f19d3c15806a6019a73b
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>