[nrf noup]: Add LTE family and protocol.

Add AF_LTE family and NPROTO_AT protocol define for nRF91 in net_ip.h.

Signed-off-by: Håkon Alseth <[email protected]>
Signed-off-by: Robert Lubos <[email protected]>
Signed-off-by: Marti Bolivar <[email protected]>
(cherry picked from commit 821c2cb)
(cherry picked from commit f507dc6)
Signed-off-by: Martí Bolívar <[email protected]>

Author: Rallare

include/net/net_ip.h

@@ -45,6 +45,7 @@ extern "C" {
 #define PF_PACKET       3          /**< Packet family.                */
 #define PF_CAN          4          /**< Controller Area Network.      */
 #define PF_NET_MGMT     5          /**< Network management info.      */
+#define PF_LTE          102        /**< Specific to LTE.              */
 
 /* Address families. */
 #define AF_UNSPEC      PF_UNSPEC   /**< Unspecified address family.   */
@@ -53,6 +54,7 @@ extern "C" {
 #define AF_PACKET      PF_PACKET   /**< Packet family.                */
 #define AF_CAN         PF_CAN      /**< Controller Area Network.      */
 #define AF_NET_MGMT    PF_NET_MGMT /**< Network management info.      */
+#define AF_LTE         PF_LTE      /**< Specific to LTE.              */
 
 /** Protocol numbers from IANA/BSD */
 enum net_ip_protocol {
@@ -74,6 +76,11 @@ enum net_ip_protocol_secure {
 	IPPROTO_DTLS_1_2 = 273,    /**< DTLS 1.2 protocol */
 };
 
+/* Protocol numbers for LTE protocols */
+enum net_lte_protocol {
+	NPROTO_AT = 513,
+};
+
 /** Socket type */
 enum net_sock_type {
 	SOCK_STREAM = 1,           /**< Stream socket type   */