drivers: shs: change shs wq timing unit from ticks to milliseconds

Change the timing unit for the shs workqueue interval from ticks(jiffies)
to milliseconds.

Change-Id: I274def5a471ea3e47ae98697e598e2f29e6f1993
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>