iommu/ipmmu-vmsa: Add an entry for r8a77961 in soc_rcar_gen3[]

Add an entry for r8a77961 in soc_rcar_gen3[] list so that we dont
enable iommu unconditionally.

Fixes: 17fe1618 ("iommu/renesas: Add support for r8a77961")
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/1594722055-9298-3-git-send-email-prabhakar.mahadev-lad.rj@bp.renesas.com


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