net/bnxt: fix compatibility with some old firmwares

net/bnxt: fix compatibility with some old firmwares

This reverts commit 3972281f47b2cc0cf844698885f0e6b4228c0975.

Reported by Red Hat QE: with older firmware versions (at least versions
20.6.112.0 and 20.6.143.0), initialisation never succeeds following this
change.
Revert it for now, waiting for a more complete fix.

Fixes: 3972281f47b2 ("net/bnxt: fix device readiness check")
Cc: stable@dpdk.org
Signed-off-by: David Marchand <david.marchand@redhat.com>
Acked-by: Ajit Khaparde <ajit.khaparde@broadcom.com>