Update X2AP to Rel.15 to support EN-DC X2 signaling for 5G Non-standalone

cmake_targets/CMakeLists.txt

@@ -469,7 +469,6 @@ endif(${X2AP_RELEASE} STREQUAL "R8")
 add_definitions(-DX2AP_VERSION=${X2AP_VERSION})
 set(X2AP_ASN_DIR ${X2AP_DIR}/MESSAGES/ASN1/${X2AP_RELEASE})
 set(X2AP_C_DIR ${asn1_generated_dir}/X2AP_${X2AP_RELEASE})
-
 # Warning: if you modify ASN.1 source file to generate new C files, cmake should be re-run instead of make
 execute_process(COMMAND ${OPENAIR_CMAKE}/tools/make_asn1c_includes.sh "${X2AP_C_DIR}" "${X2AP_ASN_DIR}/${X2AP_ASN_FILES}"  "X2AP_" -fno-include-deps
                 RESULT_VARIABLE ret)

openair2/X2AP/MESSAGES/ASN1/R15/x2ap-15.1.0.asn1

@@ -4010,7 +4010,7 @@ NRNeighbour-Information-ExtIEs X2AP-PROTOCOL-EXTENSION ::= {
 	...
 }
 
-CellAssistanceInformation ::= CHOICE {
+CellAssistanceInformation ::= CHOICE {
 	limited-list				Limited-list,
 	full-list				ENUMERATED  {allServedNRcells, ...},
 	...
@@ -6094,7 +6094,7 @@ SgNBResourceCoordinationInformationExtIEs X2AP-PROTOCOL-EXTENSION ::= {
 	...
 }
 
-SgNB-UE-X2AP-ID ::= INTEGER (0..4294967295)
+SgNB-UE-X2AP-ID ::= INTEGER (0..4294967295)
 
 SIPTOBearerDeactivationIndication ::= ENUMERATED {
 	true,