migration/multifd: Switch to no compression when no hardware support

migration/multifd: Switch to no compression when no hardware support

Send raw packets over if UADK hardware support is not available. This is to
satisfy  Qemu qtest CI which may run on platforms that don't have UADK
hardware support. Subsequent patch will add support for uadk migration
qtest.

Reviewed-by: Fabiano Rosas <farosas@suse.de>
Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Reviewed-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Signed-off-by: Fabiano Rosas <farosas@suse.de>