net/ice: clear QoS bandwidth on DCF close

net/ice: clear QoS bandwidth on DCF close

When closing DCF, the bandwidth limit configured for VFs by DCF is not
cleared correctly. The configuration will still take effect when DCF starts
again, if VFs are not re-allocated. This patch cleared VFs bandwidth limit
when DCF closes, and DCF needs to re-configure bandwidth for VFs when it
starts next time.

Fixes: 3a6bfc37eaf4 ("net/ice: support QoS config VF bandwidth in DCF")
Signed-off-by: Ting Xu <ting.xu@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>