bnxt_en: Skip nic close/open when configuring tstamp filters

We don't have to close and open the nic to make sure we have
valid rx timestamps. Once we have the timestamp filter applied to
the HW and the timestamp_fld_format bit is cleared in the rx
completion and the timestamp is non-zero, we can be sure that rx
timestamp is valid data.

Skip close/open when we set any timestamp filter.

Reviewed-by: Andy Gospodarek <andrew.gospodarek@broadcom.com>
Signed-off-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Link: https://lore.kernel.org/r/20231212005122.2401-13-michael.chan@broadcom.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>