net/bnxt: add functions to get shared table increments

net/bnxt: add functions to get shared table increments

Add TRUFLOW API to get the shared table increment value
for a given TRUFLOW table type.
The API is being added for Wh+ and Thor devices.

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