ARM: vGICv3: handle virtual LPI pending and property tables

ARM: vGICv3: handle virtual LPI pending and property tables

Allow a guest to provide the address and size for the memory regions
it has reserved for the GICv3 pending and property tables.
We sanitise the various fields of the respective redistributor
registers.
The MMIO read and write accesses are protected by locks, to avoid any
changing of the property or pending table address while a redistributor
is live and also to protect the non-atomic vgic_reg64_extract() function
on the MMIO read side.

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