iwlegacy: remove unused power commands defines

#define IWL_POWER_VEC_SIZE 5

#define IWL_POWER_DRIVER_ALLOW_SLEEP_MSK	cpu_to_le16(BIT(0))

#define IWL_POWER_POWER_SAVE_ENA_MSK		cpu_to_le16(BIT(0))

#define IWL_POWER_POWER_MANAGEMENT_ENA_MSK	cpu_to_le16(BIT(1))

#define IWL_POWER_SLEEP_OVER_DTIM_MSK		cpu_to_le16(BIT(2))

#define IWL_POWER_PCI_PM_MSK			cpu_to_le16(BIT(3))

#define IWL_POWER_FAST_PD			cpu_to_le16(BIT(4))

#define IWL_POWER_BEACON_FILTERING		cpu_to_le16(BIT(5))

#define IWL_POWER_SHADOW_REG_ENA		cpu_to_le16(BIT(6))

#define IWL_POWER_CT_KILL_SET			cpu_to_le16(BIT(7))

struct iwl3945_powertable_cmd {

	__le16 flags;