msm: camera: utils: Add logic to maintain unique buffer handle for patch

Currently smmu_get_iova is called for every patch, regardless of the same
source handle. This change avoids this by checking if io virtual address
is already being quried with earlier patch. This can reduce the call and
mutex operation from smmu prospective.

CRs-Fixed: 2711810
Change-Id: I681589cd1328389e0828a3318edad1a2a91d8547
Signed-off-by: Jigarkumar Zala <jzala@codeaurora.org>