mfd: Add "platform:" prefix for twl4030-madc platform modalias

Since 43cc71eed1250755986da4c0f9898f9a635cb3bf (platform: prefix MODALIAS
with "platform:"), the platform modalias is prefixed with "platform:".

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/mfd/twl4030-madc.c

@@ -799,4 +799,4 @@ module_exit(twl4030_madc_exit);
 MODULE_DESCRIPTION("TWL4030 ADC driver");
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("J Keerthy");
-MODULE_ALIAS("twl4030_madc");
+MODULE_ALIAS("platform:twl4030_madc");