iwlwifi: each device has its own eeprom tx power version

Each device has it own eeprom, so the tx power version could be
different, define TX_POWER_VERSION per device.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>