bnxt_en: Perform function reset earlier during probe.

The firmware call to do function reset is done too late.  It is causing
the rings that have been reserved to be freed.  In NPAR mode, this bug
is causing us to run out of rings.

Fixes: 391be5c2 ("bnxt_en: Implement new scheme to reserve tx rings.")
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>