xen/arm: p2m: Pass the vCPU in parameter to get_page_from_gva

xen/arm: p2m: Pass the vCPU in parameter to get_page_from_gva

The function get_page_from_gva translates a guest virtual address to a
machine address. The translation involves the register VTTBR_EL2,
TTBR0_EL1, TTBR1_EL1 and SCTLR_EL1. Whilst the first register is per
domain (the p2m is common to every vCPUs), the last 3 are per-vCPU.

Therefore, the function should take the vCPU in parameter and not the
domain. Fixing the actual code path will be done a separate patch.

Signed-off-by: Julien Grall <julien.grall@arm.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>