dpif-netdev: Optimize rwlock in port query API. #2957

Job	Run time
dpdk gcc (ubuntu-24.04)	8s
libreswan (ubuntu-24.04)	7s
osx clang --disable-ssl	1m 50s
linux rpm fedora	3m 42s
linux deb no dpdk	12m 48s
clang-analyze-cache	11m 17s
linux gcc --disable-ssl	4m 26s
linux clang --disable-ssl	4m 30s
linux clang c99	3m 28s
linux gcc c99	3m 10s
linux clang check check-dpdk dpdk	20m 11s
linux clang test -ljemalloc	11m 10s
linux gcc test	10m 58s
linux clang address,undefined test	18m 34s
linux gcc test --enable-shared	12m 9s
linux clang --enable-afxdp	2m 51s
linux gcc test -ljemalloc	10m 54s
linux clang test --enable-shared	12m 8s
linux gcc check check-dpdk dpdk	19m 51s
linux gcc check-ovsdb-cluster	9m 44s
linux gcc dpdk-shared	3m 48s
linux gcc dpdk --enable-shared	12m 56s
linux clang dpdk --enable-shared	5m 27s
linux gcc --enable-afxdp	4m 13s
linux gcc check-kernel 100-	19m 15s
linux gcc dpdk-shared --enable-shared	4m 33s
linux clang dpdk-shared	5m 53s
linux gcc m32 --disable-ssl	4m 12s
linux gcc dpdk check-system-tso	13m 52s
linux gcc check-offloads 100-	17m 1s
linux clang address,undefined check-kernel 100-	24m 29s
linux clang address,undefined dpdk check-system-userspace	16m 42s
linux gcc check-offloads -100	10m 8s
linux gcc dpdk check-afxdp	14m 11s
linux clang address,undefined check-kernel -100	17m 15s
linux clang dpdk-shared --enable-shared	6m 24s
linux gcc check-kernel -100	12m 21s
linux gcc dpdk check-system-userspace	13m 37s
clang-analyze	12m 54s
	6h 33m 7s

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