net/bnxt: move macro definitions to header file

Move device and vendor ids macro definition from bnxt_ethdev.c
to bnxt.h.
There is no functionality impact.

Fixes: 882aa9c6e2e1 ("net/bnxt: move PCI device ids to the driver")
Cc: stable@dpdk.org
Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Reviewed-by: Lance Richardson <lance.richardson@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>