samples: bluetooth/mesh: Add Friend support

CONFIG_BT_MESH=y

CONFIG_BT_MESH_RELAY=y

CONFIG_BT_MESH_LOW_POWER=n

CONFIG_BT_MESH_FRIEND=n

CONFIG_BT_MESH_FRIEND=y

CONFIG_BT_MESH_FRIEND_QUEUE_SIZE=16

CONFIG_BT_MESH_ADV_BUF_COUNT=20

CONFIG_BT_MESH_PB_GATT=y

#CONFIG_BT_DEBUG_MONITOR=y

CONFIG_BT_DEBUG_LOG=y

#CONFIG_BT_MESH_DEBUG=y

CONFIG_BT_MESH_DEBUG=y

#CONFIG_BT_MESH_DEBUG_PROV=y

#CONFIG_BT_MESH_DEBUG_PROXY=y

#CONFIG_BT_MESH_DEBUG_BEACON=y

#CONFIG_BT_MESH_DEBUG_NET=y

#CONFIG_BT_MESH_DEBUG_TRANS=y

CONFIG_BT_MESH_DEBUG_NET=y

CONFIG_BT_MESH_DEBUG_TRANS=y

#CONFIG_BT_MESH_DEBUG_LOW_POWER=y

#CONFIG_BT_MESH_DEBUG_FRIEND=y

CONFIG_BT_MESH_DEBUG_FRIEND=y

#CONFIG_BT_MESH_DEBUG_MODEL=y

#CONFIG_BT_MESH_DEBUG_ACCESS=y

#CONFIG_BT_MESH_DEBUG_CRYPTO=y

static struct bt_mesh_cfg cfg_srv = {

	.relay = BT_MESH_RELAY_DISABLED,

	.beacon = BT_MESH_BEACON_ENABLED,

#if defined(CONFIG_BT_MESH_FRIEND)

	.frnd = BT_MESH_FRIEND_ENABLED,

#else

	.frnd = BT_MESH_FRIEND_NOT_SUPPORTED,

#endif

#if defined(CONFIG_BT_MESH_GATT_PROXY)

	.gatt_proxy = BT_MESH_GATT_PROXY_ENABLED,

#else