Release for gen3-test v3

ipmmu-vmsa: Add CONFIG_RCAR_IPMMU_PGT_IS_SHARED

Make it possible to configure Xen/IPMMU shared page tables for
Renesas R-Car's H3 v3.0 and M3N boards which have the IPMMU that
does handle stage 2 translation table format and as the result
is able to share P2M with the CPU.

Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Suggested-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Reviewed-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Reviewed-by: Andrii Anisov <andrii_anisov@epam.com>