hvm: Allow HVM guests direct access to 0xed debug/delay port

hvm: Allow HVM guests direct access to 0xed debug/delay port

Port 0x80 is already passed-through.  Writes to port 0x80 are
traditionally used as IO delay.  Recent Linux kernel versions can be
configured to use port 0xed instead (CONFIG_IO_DELAY_0XED=3Dy).
Ubuntu 8.04 and later kernels are configured to use port 0xed.

In Linux IO delay is implemented by (in|out)[bwl]_p.  From a first
glance at Linux it looks like the only relevant usage of delayed IO is
in drivers/video/console/vgacon.c.  Affected is VGA console
initialization and font setup.  Output / scrolling is not affected.

Signed-off-by: Thomas Friebel <thomas.friebel@amd.com>