cmake DPDK examples

ceph/ceph CMakeLists.txt :497 

find_package(dpdk)

seladb/PcapPlusPlus CMakeLists.txt :253 

find_package(DPDK)

asset-group/5ghoul-5g-nr-attacks libs/libpcap/CMakeLists.txt :1580 

find_package(dpdk)

CTSRD-CHERI/cheribsd contrib/libpcap/CMakeLists.txt :2341 

find_package(dpdk)