pkg/specgen/generate: NOP verifyContainerResources() on freebsd

There is no point in calling into cgroup specific code as freebsd does
not support cgroups.

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

pkg/specgen/generate/validate_freebsd.go

@@ -0,0 +1,8 @@
+package generate
+
+import "github.com/containers/podman/v4/pkg/specgen"
+
+// verifyContainerResources does nothing on freebsd as it has no cgroups
+func verifyContainerResources(s *specgen.SpecGenerator) ([]string, error) {
+	return nil, nil
+}