linux-imx

tools/lguest: insert driver references from the 1.0 spec (4.1 Virtio Over PCI)

As a demonstration, the lguest launcher is pretty strict, trying to
catch badly behaved drivers.  Document this precisely.

A good implementation would *NOT* crash the guest when these happened!

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>