hrtimer: Ensure timer is not running before migrating

A timer might be running when we are trying to move the timer to another
CPU so ensure that we wait for the timer to finish before migrating.

Change-Id: I1dfb57e4dd1bc676193e7ffe4b0d14a5e0df3d00
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>
[rameezmustafa@codeaurora.org: Port to msm-4.9]
Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org>
[satyap@codeaurora.org: Port to 4.19 and fix merge conflicts]
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>