net/bnxt: remove devargs option for stats accumulation

net/bnxt: remove devargs option for stats accumulation

The accumulation of flow counters is not determined by the application
device arguments anymore. Instead it is now dictated by the platform
capabilities whether to do software based accumulation or not.

Signed-off-by: Kishore Padmanabha <kishore.padmanabha@broadcom.com>
Signed-off-by: Venkat Duvvuru <venkatkumar.duvvuru@broadcom.com>
Reviewed-by: Mike Baucom <michael.baucom@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>