iommu/dma: simplify dma_iova_destroy() and drop the free_iova helper

dma_iova_destroy() frees the IOVA space through __iommu_dma_iova_unlink()
using a "free_iova" boolean, which duplicates the IOVA free logic in
dma_iova_free(). And it frees using the unmapped @mapped_len, which for a
partially linked reservation is smaller than the reserved size. This
results in a benign waste as pointed out by Robin, not a leak. So this is
a cleanup, not a fix.

Drop the duplicated free path. Fold __iommu_dma_iova_unlink into
dma_iova_unlink and remove the free_iova parameter so it only unmaps.
dma_iova_destroy then unlinks the mapped range if mapped_len is set and
unconditionally calls dma_iova_free, which frees the whole reservation
via dma_iova_size. The freed size now always matches the reserved size,
and destroy reads as unlink then free.

Note that dma_iova_destroy() no longer routes the free through the flush
queue; teardown now unmaps synchronously and frees directly, matching
dma_iova_free().

No functional change intended for callers.

Suggested-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Honglei Huang <honghuan@amd.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20260703033729.455358-1-honghuan@amd.com

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