dpdk: update README #381

Job	Run time
check / clang-checks	1m 18s
check / editor-config	6s
build-os-matrix	4s
build (oraclelinux:10) / build	2m 1s
make-tests (oraclelinux:10) / tests	1m 30s
rpm-build (oraclelinux:10) / rpm-build	5m 30s
ipfix-elements-check / ipfix-elements-checks	20s
rpm-install (oraclelinux:10) / rpm-install	55s
	11m 44s

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