printServerWarningsLegacy: silence "No oom kill disable support" on cgroup v2

The warning should be ignored on cgroup v2 hosts.

Relevant: https://github.com/moby/moby/pull/41894/commits/8086443a449af8ef5c5b0574de8957df7e52f296

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
(cherry picked from commit 05ec0188fa)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

cli/command/system/info.go

@@ -402,7 +402,7 @@ func printServerWarningsLegacy(dockerCli command.Cli, info types.Info) {
 	if !info.SwapLimit {
 		fmt.Fprintln(dockerCli.Err(), "WARNING: No swap limit support")
 	}
-	if !info.OomKillDisable {
+	if !info.OomKillDisable && info.CgroupVersion != "2" {
 		fmt.Fprintln(dockerCli.Err(), "WARNING: No oom kill disable support")
 	}
 	if !info.CPUCfsQuota {