ASoC: trivial: system spelling fix

Do s/ststem/system/ .
Signed-off-by: NMarek Vasut <marex@denx.de>
Signed-off-by: NMark Brown <broonie@kernel.org>

sound/soc/generic/Kconfig

@@ -13,4 +13,4 @@ config SND_SIMPLE_SCU_CARD
 	select SND_SIMPLE_CARD_UTILS
 	help
 	  This option enables generic simple SCU sound card support.
-	  It supports DPCM of multi CPU single Codec ststem.
+	  It supports DPCM of multi CPU single Codec system.