dt-bindings: iommu: renesas,ipmmu-vmsa: add r8a77961 support

Add support for r8a77961 (R-Car M3-W+).

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/1591873830-10128-2-git-send-email-yoshihiro.shimoda.uh@renesas.com


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