Bluetooth: Mesh: Add macros to encoded model publication periods

				 u16_t mod_app_idx, u16_t mod_id, u16_t cid,

				 u8_t *status);

/** @def BT_MESH_PUB_PERIOD_100MS

 *

 *  @brief Helper macro to encode model publication period in units of 100ms

 *

 *  @param steps Number of 100ms steps.

 *

 *  @return Encoded value that can be assigned to bt_mesh_cfg_mod_pub.period

 */

#define BT_MESH_PUB_PERIOD_100MS(steps)  ((steps) & BIT_MASK(6))

/** @def BT_MESH_PUB_PERIOD_SEC

 *

 *  @brief Helper macro to encode model publication period in units of 1 second

 *

 *  @param steps Number of 1 second steps.

 *

 *  @return Encoded value that can be assigned to bt_mesh_cfg_mod_pub.period

 */

#define BT_MESH_PUB_PERIOD_SEC(steps)   (((steps) & BIT_MASK(6)) | (1 << 6))

/** @def BT_MESH_PUB_PERIOD_10SEC

 *

 *  @brief Helper macro to encode model publication period in units of 10

 *  seconds

 *

 *  @param steps Number of 10 second steps.

 *

 *  @return Encoded value that can be assigned to bt_mesh_cfg_mod_pub.period

 */

#define BT_MESH_PUB_PERIOD_10SEC(steps) (((steps) & BIT_MASK(6)) | (2 << 6))

/** @def BT_MESH_PUB_PERIOD_10MIN

 *

 *  @brief Helper macro to encode model publication period in units of 10

 *  minutes

 *

 *  @param steps Number of 10 minute steps.

 *

 *  @return Encoded value that can be assigned to bt_mesh_cfg_mod_pub.period

 */

#define BT_MESH_PUB_PERIOD_10MIN(steps) (((steps) & BIT_MASK(6)) | (3 << 6))

struct bt_mesh_cfg_mod_pub {

	u16_t  addr;

	u16_t  app_idx;