iommu: arm-smmu: Fix transaction flags in qsmmuv500_iova_to_phys

While performing ecats in qsmmuv500_iova_to_phys, transaction flags
are incorrectly set using flag variable instead of trans_flags variable.
Fix this.

Fixes: efa31e1d ("iommu/arm-smmu: replicate faulty transaction")
Change-Id: Ia8f46708e717a91c0d10a66cd53ed7298068f664
Signed-off-by: Vijayanand Jitta <vjitta@codeaurora.org>