net/qede: prevent crash while changing MTU dynamically

net/qede: prevent crash while changing MTU dynamically

The driver can handle dynamic MTU change without needing the port to be
stopped explicitly by the application. However, there is currently no
check to prevent I/Os from happening on a different thread while the
port is going thru' reset internally. This patch fixes this issue by
assigning RX/TX burst functions to a dummy function and also reconfigure
RX bufsize for each rx queue based on the new MTU value.

Fixes: 200645ac7909 ("net/qede: set MTU")
Cc: stable@dpdk.org
Signed-off-by: Harish Patil <harish.patil@qlogic.com>