arm/ioreq: Introduce arch specific bits for IOREQ/DM features

arm/ioreq: Introduce arch specific bits for IOREQ/DM features

This patch adds basic IOREQ/DM support on Arm. The subsequent
patches will improve functionality and add remaining bits.

The IOREQ/DM features are supposed to be built with IOREQ_SERVER
option enabled, which is disabled by default on Arm for now.

Please note, the "PIO handling" TODO is expected to left unaddressed
for the current series. It is not an big issue for now while Xen
doesn't have support for vPCI on Arm. On Arm64 they are only used
for PCI IO Bar and we would probably want to expose them to emulator
as PIO access to make a DM completely arch-agnostic. So "PIO handling"
should be implemented when we add support for vPCI.

Signed-off-by: Julien Grall <julien.grall@arm.com>
Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
[On Arm only]
Tested-by: Wei Chen <Wei.Chen@arm.com>