avtimer: msm: fix to avoid timejump in avtimer

In VT call, observe timestamp jump in avtimer
causing issue in camera timestamps.
By doing division with clk_div on avtimer tick,
timestamp is calculate correctly now.

Change-Id: I8d1c8d162ee28b6430c9c2e6ca323e212bacfbf2
CRs-Fixed: 726296
Signed-off-by: Laxminath Kasam <lkasam@codeaurora.org>