leds: Add mail LED support for "Clevo D400P"

The leds-clevo-mail module also works with model "Clevo D400P",
add this model to the white list.

Signed-off-by: Mrton Nmeth <nm127@freemail.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index eb97c41..4f56248 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -127,6 +127,7 @@
 
 	  This module can drive the mail LED for the following notebooks:
 
+	  	Clevo D400P
 	  	Clevo D410J
 	  	Clevo D410V
 	  	Clevo D400V/D470V (not tested, but might work)
@@ -134,6 +135,9 @@
 	  	Clevo M5x0N (not tested, but might work)
 	  	Positivo Mobile (Clevo M5x0V)
 
+	  If your model is not listed here you can try the "nodetect"
+	  module paramter.
+
 	  To compile this driver as a module, choose M here: the
 	  module will be called leds-clevo-mail.