Kconfig: fixo typo in "Xilinx'"

Signed-off-by: Michael Witten <mfwitten@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

sound/drivers/Kconfig

@@ -155,7 +155,7 @@ config SND_ML403_AC97CR
 	select SND_AC97_CODEC
 	help
 	  Say Y here to include support for the
-	  opb_ac97_controller_ref_v1_00_a ip core found in Xilinx' ML403
+	  opb_ac97_controller_ref_v1_00_a ip core found in Xilinx's ML403
 	  reference design.
 
 	  To compile this driver as a module, choose M here: the module