508dad9261
During secure video to secure ui transition, since secure ui requires s2 direct translation, display driver will detach the iommu device after unmap of the buffers attached to the CB. In this regard, upstream framework which can independently request for buffer free to unmap on the buffer creates an illegal state where in dma ops are attached and iommu device is dettached. Cache the dma ops before detaching the CB and set it to NULL during iommu device detach, to avoid multiple unmap calls on the buffer. Change-Id: I11cd33f5f52b8c9c4f3a627c520bff57e340c8a4 Signed-off-by: Jayaprakash <jmadiset@codeaurora.org>