iommu/fsl_pamu: replace DOMAIN_ATTR_FSL_PAMU_STASH with a direct call

Add a fsl_pamu_configure_l1_stash API that qman_portal can call directly
instead of indirecting through the iommu attr API.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Will Deacon <will@kernel.org>
Acked-by: Li Yang <leoyang.li@nxp.com>
Link: https://lore.kernel.org/r/20210401155256.298656-8-hch@lst.de


Signed-off-by: Joerg Roedel <jroedel@suse.de>