net/bnxt: fix forwarding with higher mbuf size

net/bnxt: fix forwarding with higher mbuf size

Maximum frame length supported by hw is 9600 bytes.
When user launches testpmd with --mbuf-size=9729,
we are posting buffer descriptors of size 9601 to the ring.
This was causing packets getting discarded.

Fixes: daef48efe5e5 ("net/bnxt: support set MTU")
Cc: stable@dpdk.org
Signed-off-by: Santoshkumar Karanappa Rastapur <santosh.rastapur@broadcom.com>
Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Signed-off-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
Reviewed-by: Somnath Kotur <somnath.kotur@broadcom.com>
Reviewed-by: Lance Richardson <lance.richardson@broadcom.com>