net/bnxt: manage VF to VFR conduit

When VF-VFR conduits are created, a mark is added to the mark database.
mark_flag indicates whether the mark is valid and has VFR information
(VFR_ID bit in mark_flag). Rx path was checking for this VFR_ID bit.
However, while adding the mark to the mark database, VFR_ID bit is not
set in mark_flag.

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>