net/bnxt: fix VF representor port add

net/bnxt: fix VF representor port add

Fix VF representor port add when it's endpoint interface is down.
While adding vf representor port to a bridge, vnic & svif information of
vf representors endpoint(VF) would be needed to program default flow
rules.
However, if the endpoint interface is down when vf representor port is
added, firmware will return invalid vnic & svif information.

This patch fixes the problem by registering to DEFAULT_VNIC_CHANGE
async event and once the async event is received, use the endpoint
information(VF's fid) to fetch it's vnic & svif information and
program the default flow rules.

Fixes: 322bd6e70272 ("net/bnxt: add port representor infrastructure")
Cc: stable@dpdk.org
Signed-off-by: Venkat Duvvuru <venkatkumar.duvvuru@broadcom.com>
Reviewed-by: Somnath Kotur <somnath.kotur@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>