net/bnxt: add global config set and get functions

- Add support to update global configuration for ACT_TECT
  and ACT_ABCR.
- Add support to allow Tunnel and Action global configuration.
- Remove register read and write operations.
- Remove the register read and write support.

Signed-off-by: Jay Ding <jay.ding@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>