netdev-offload-dpdk: Support QinQ offload. #6690

Job	Run time
dpdk gcc (ubuntu-24.04)	5s
linux rpm fedora	4m 1s
linux deb no dpdk	7m 31s
libreswan (ubuntu-24.04)	5s
build oss-fuzz fuzzers	2m 51s
osx clang --disable-ssl	1m 38s
clang-analyze-cache	12m 38s
linux gcc --disable-ssl	2m 28s
linux clang --disable-ssl	2m 43s
linux gcc c99	2m 31s
linux clang c99	4m 3s
linux gcc test	8m 25s
linux clang address,undefined test	16m 31s
linux gcc test --enable-shared	11m 21s
linux clang test --enable-shared	10m 55s
linux gcc check check-dpdk dpdk	20m 56s
linux clang check check-dpdk dpdk	20m 52s
linux gcc test -ljemalloc	9m 6s
linux clang test -ljemalloc	8m 50s
linux gcc --enable-afxdp	2m 45s
linux clang --enable-afxdp	4m 9s
linux gcc dpdk --enable-shared	3m 40s
linux clang dpdk --enable-shared	3m 39s
linux gcc dpdk-shared	2m 49s
linux clang dpdk-shared	2m 53s
linux gcc dpdk-shared --enable-shared	3m 36s
linux clang dpdk-shared --enable-shared	3m 48s
linux gcc m32 --disable-ssl	2m 30s
linux gcc check-ovsdb-cluster	9m 23s
linux gcc check-kernel -100	11m 57s
linux gcc check-kernel 100-	16m 48s
linux clang address,undefined check-kernel -100	12m 58s
linux clang address,undefined check-kernel 100-	19m 41s
linux gcc check-offloads -100	9m 59s
linux gcc check-offloads 100-	11m 59s
linux gcc dpdk check-system-userspace	12m 37s
linux clang address,undefined dpdk check-system-userspace	17m 35s
linux gcc dpdk check-system-tso	12m 36s
linux gcc dpdk check-afxdp	12m 1s
clang-analyze	10m 49s
	5h 35m 42s

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