net/bnxt: remove redundant macro

net/bnxt: remove redundant macro

Use "dev->data->dev_started" state, instead of local BNXT_FLAG_INIT_DONE
to check whether device has been initialised or not.

Fixes: ed2ced6fe927 ("net/bnxt: check initialization before accessing stats")
Cc: stable@dpdk.org
Reviewed-by: Santoshkumar Karanappa Rastapur <santosh.rastapur@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
Signed-off-by: Somnath Kotur <somnath.kotur@broadcom.com>
Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>