minor: change output directory's name for NR RRC

it was 'NR_Rel15' and now it is 'RRC_NR_Rel15'

cmake_targets/CMakeLists.txt

@@ -346,7 +346,7 @@ if (${NR_RRC_ASN1_VERSION} STREQUAL "NR_Rel15")
   set (NR_RRC_GRAMMAR ${OPENAIR2_DIR}/RRC/NR/MESSAGES/asn1c/ASN1_files/nr-rrc-15.6.0.asn1)
 endif  (${NR_RRC_ASN1_VERSION} STREQUAL "NR_Rel15")
 add_definitions(-DNR_RRC_VERSION=${NR_RRC_VERSION})
-set (NR_RRC_FULL_DIR ${asn1_generated_dir}/${NR_RRC_ASN1_VERSION})
+set (NR_RRC_FULL_DIR ${asn1_generated_dir}/RRC_${NR_RRC_ASN1_VERSION})
 
 # Warning: if you modify ASN.1 source file to generate new C files, cmake should be re-run instead of make
 execute_process(COMMAND ${OPENAIR_CMAKE}/tools/make_asn1c_includes.sh "${NR_RRC_FULL_DIR}" "${NR_RRC_GRAMMAR}" "NR_" "-findirect-choice"