vhost: interrupt mode support with mq

vhost: interrupt mode support with mq

vhost interrupt mode support with mq does not work when coalesce frame
is not configured to 0.

When packed-ring is configured, we were also setting the wrong flag
for want-interrupt.

No need to trigger an interrupt to RX infra if there is at least one
queue in the same thread that is doing polling.

Type: fix

Signed-off-by: Steven Luong <sluong@cisco.com>
Change-Id: I8e64250f2aa6bf611a777a53e4d2c1076d83305f