net/bnxt: support clear on read

net/bnxt: support clear on read

Add clear on read stats support for Thor. Currently, the
flow stats are not cleared after they are read from the FW.
This patch adds support for clear on read. Since clear on
read support is added for flow stats in Thor, the flow
accumulation is enabled on Thor as well.

Signed-off-by: Farah Smith <farah.smith@broadcom.com>
Signed-off-by: Kishore Padmanabha <kishore.padmanabha@broadcom.com>
Signed-off-by: Venkat Duvvuru <venkatkumar.duvvuru@broadcom.com>
Reviewed-by: Randy Schacher <stuart.schacher@broadcom.com>
Reviewed-by: Shahaji Bhosle <sbhosle@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>