[ALSA] Add dummy obsoleted module options for backward compatibility

Added dummay obsoleted module options for backward compatibility
(to reduce possible bugzilla entries :)

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/intel8x0.c b/sound/pci/intel8x0.c
index a82f3b6..352c2cc 100644
--- a/sound/pci/intel8x0.c
+++ b/sound/pci/intel8x0.c
@@ -87,6 +87,12 @@
 module_param(xbox, bool, 0444);
 MODULE_PARM_DESC(xbox, "Set to 1 for Xbox, if you have problems with the AC'97 codec detection.");
 
+/* just for backward compatibility */
+static int enable;
+module_param(enable, int, 0444);
+static int joystick;
+module_param(joystick, int, 0444);
+
 /*
  *  Direct registers
  */