xen/arm: acpi: Relax hw domain mapping attributes to p2m_mmio_direct_c

xen/arm: acpi: Relax hw domain mapping attributes to p2m_mmio_direct_c

Since the hardware domain is a trusted domain, we extend the
trust to include making final decisions on what attributes to
use when mapping memory regions.

For ACPI configured hardware domains, this patch relaxes the hardware
domains mapping attributes to p2m_mmio_direct_c. This will allow the
hardware domain to control the attributes via its S1 mappings.

Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Acked-by: Julien Grall <julien.grall@arm.com>
Acked-by: Stefano Stabellini <sstabellini@kernel.org>