Using kvm can provide significant speedups when running qemux86* machines
on an x86* host. Enabled by using the new QEMU_USE_KVM variable.
[YOCTO #9298]
(From OE-Core rev: ebac2c8d1fcd09ebce0659a4abb445e4f1c18571)
Signed-off-by: Bill Randle <william.c.randle@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>