msm: vidc: Fix iommu pagefault in concurrent scenario

IOMMU pagefault is seen while running decoder and
encoder concurrently for specific codec combination.
Map double the buffer size to ion_map_iommu() API for
encoder reconstruction buffers to avoid the pagefault.

Change-Id: Ib5546a42a75c4c628767310f1a291e7ed443056c
CRs-fixed: 450621
Signed-off-by: Maheshwar Ajja <majja@codeaurora.org>
msm: vidc: unsecure heaps in the right order during error handling

Unsecure MM and CP heaps in the right order in case of failure
CRs-Fixed: 445400

Change-Id: I2b5d414c5d9f109740a931b75b0cfbdb196c465f
Signed-off-by: Praveen Chavan <pchava@codeaurora.org>