Creating UL_ind RACH handle function in VNF

Also fixed a few bugs in nr-nFAPI:
- Push16->push8 fix in packing of RACH
- Allocating memory for pdu_list and preamble_list in unpack
- Properly indexing through both lists during unpack
- Created new nr_rach handling function

nfapi/open-nFAPI/vnf/public_inc/nfapi_vnf_interface.h

@@ -760,6 +760,20 @@ typedef struct nfapi_vnf_p7_config
 	 */
 	int (*rach_indication)(struct nfapi_vnf_p7_config* config, nfapi_rach_indication_t* ind);
 
+        /*! A callback for the RACH.indication
+     *  \param config A pointer to the vnf p7 configuration
+	 *  \param ind A data structure for the decoded nrRACH.indication This will
+	 *              have been allocated on the stack.
+	 *  \return not currently used.
+	 *
+	 *  The ind may contain pointers to dyanmically allocated sub structures
+	 *  such as the pdu. The dyanmically allocated structure will
+	 *  be deallocated on return. If the client wishes to 'keep' the structures
+	 *  then the substructure pointers should be set to 0 and then the client should
+	 *  use the codec_config.deallocate function to release it at a future point
+	 */
+	int (*nr_rach_indication)(struct nfapi_vnf_p7_config* config, nfapi_nr_rach_indication_t* ind);
+
 	/*! A callback for the SRS.indication
      *  \param config A pointer to the vnf p7 configuration
 	 *  \param ind A data structure for the decoded SRS.indication This will