Files without license header to begin with or left out in the SPDX replacement

[krsna1729]

The below files currently do not have the SPDX license identifier and/or copyright

$ grep -rL 'SPDX-License-Identifier: Apache-2.0' * \
--exclude=\*.{cfg,pcap,patch,csv,gitignore,txt,pem} --exclude=LICENSE 

config/ng-core_cfg.mk
cp/chk_cpcfg.sh
cp_dp_api/vepc_cp_dp_api.c
dp/chk_dpcfg.sh
dp/gtpu_echo.c
dp/commands.c
dp/pipeline/epc_arp_icmp_api.hlp
dp/perf_timer.h
dp/timer_stats.c
dp/build_ngic.sh
kni_ifcfg/kni-S1Udevcfg.sh
kni_ifcfg/kni-S1Udevdel.sh
kni_ifcfg/kni-SGIdevdel.sh
kni_ifcfg/kni-SGIdevcfg.sh
test/zmq_device/req_streamer_dev.py
test/zmq_device/resp_streamer_dev.py
test/fmea/test_fmea.sh