irq_domain: correct the debugfs file name

The actual name of the irq_domain mapping debugfs file is
"irq_domain_mapping" not "virq_mapping".

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/kernel/irq/Kconfig b/kernel/irq/Kconfig
index cf1a4a6..d1a758b 100644
--- a/kernel/irq/Kconfig
+++ b/kernel/irq/Kconfig
@@ -62,7 +62,7 @@
 	help
 	  This option will show the mapping relationship between hardware irq
 	  numbers and Linux irq numbers. The mapping is exposed via debugfs
-	  in the file "virq_mapping".
+	  in the file "irq_domain_mapping".
 
 	  If you don't know what this means you don't need it.