remoteproc/omap: Trigger IOMMU during crash recovery sequence

Trigger IOMMU during crash recovery sequence to reset IOMMU also.
Otherwise IOMMU may end up in a stale state, causing the remoteproc to
hang or crash again.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Suman Anna <s-anna@ti.com>