Revert "genirq/msi: Store the IOMMU IOVA directly in msi_desc instead of iommu_cookie"

This reverts commit e4d37632 which is
commit 1f7df3a6 upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: Ib0d3d22614baadb6bd1a924fb46a905e05f4b23b
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>