Move "tx power per chain" into ucode_tx_stats, it is debugging
information provided by uCode as part of statistics notification.

The "tx power per chain" parameters are optional parameters which only
supported by 6000 series device today; those are reserved fields for all
the other devices.
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>