Enable and start vsock and http crc sockets

This patch fix the scenario when a user try to reboot the host
and try to run `crc start` on an already configured host. Without
this patch user observes following error during `crc start`.
```
INFO Checking crc daemon systemd socket units
WARN Preflight checks failed during `crc start`, please try to run `crc setup` first in case you haven't done so yet
```

It happen because systemd service is not enabled by the `crc setup`
command.

fixes: #2739

pkg/crc/preflight/preflight_checks_linux.go

@@ -379,6 +379,9 @@ func fixSystemdUnit(unitName string, unitContent string, shouldBeRunning bool) e
 	running := systemdUnitRunning(sd, unitName)
 	if !running && shouldBeRunning {
 		logging.Debugf("Starting %s", unitName)
+		if err := sd.Enable(unitName); err != nil {
+			return err
+		}
 		return sd.Start(unitName)
 	} else if running && !shouldBeRunning {
 		logging.Debugf("Stopping %s", unitName)