msm_fb: display: fix iommu leak during base layer swap
Retain RGB1 iommu information during base layer swap
so that iommu used by RGB1 can be freed back to pool later.
CRs-fixed: 403277
Change-Id: Ibed85179284743dc8a9d1434f0c81626b0567e16
Signed-off-by:
Kuogee Hsieh <khsieh@codeaurora.org>
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