firmware, qemu: Change ACPI IO values to match QEMU BIOS

firmware, qemu: Change ACPI IO values to match QEMU BIOS

As part of the QEMU/Xen merge, this patch comes to change the value of
sleep states and add some information in the PCI registers to match the
implementation of the BIOS of QEMU.

It also does a hypercall (HVM_PARAM_ACPI_IOPORTS_LOCATION) that tell the
Xen to use the new Port I/O instead of the old one.

[ Also, in this patch, update QEMU_TAG to the qemu-xen revision
  with the corresponding qemu change. -iwj ]

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>