net/bnxt: enable filter ctrl ops for port representor

Inorder to offload flows on the vfrep device, it must be
populated with rte_flow_ops.

This patch enables the same.

Signed-off-by: Somnath Kotur <somnath.kotur@broadcom.com>
Signed-off-by: Venkat Duvvuru <venkatkumar.duvvuru@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>