ALSA: aloop: Fix spelling mistake "synchronization" -> "synchronization"

There is a spelling mistake in the Kconfig text. Fix it.
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20210719103044.15315-1-colin.king@canonical.comSigned-off-by: NTakashi Iwai <tiwai@suse.de>

sound/drivers/Kconfig

@@ -102,7 +102,7 @@ config SND_ALOOP
 	  configured number of substreams (see the pcm_substreams module
 	  parameter).
 
-	  The loopback device allows time sychronization with an external
+	  The loopback device allows time synchronization with an external
 	  timing source using the time shift universal control (+-20%
 	  of system time).