ALSA: hda/common: Use system_device_crosststamp::sys_systime

sys_systime is an alias for sys_realtime. The latter will be removed so
switch the code over to the new naming scheme.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Tested-by: Arthur Kiyanovski <akiyano@amazon.com>
Reviewed-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Link: https://patch.msgid.link/20260529195557.995298795@kernel.org

sound/hda/common/controller.c

@@ -525,7 +525,7 @@ static int azx_get_time_info(struct snd_pcm_substream *substream,
 			break;
 
 		default:
-			*system_ts = ktime_to_timespec64(xtstamp.sys_realtime);
+			*system_ts = ktime_to_timespec64(xtstamp.sys_systime);
 			break;
 
 		}