leds: Standardise LED naming scheme

As discussed on LKML some notion of 'function' is needed in
LED naming. This patch adds this to the documentation and
standardises existing LED drivers.

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
diff --git a/drivers/leds/leds-clevo-mail.c b/drivers/leds/leds-clevo-mail.c
index 50aaa0b..49a7972 100644
--- a/drivers/leds/leds-clevo-mail.c
+++ b/drivers/leds/leds-clevo-mail.c
@@ -93,7 +93,7 @@
 }
 
 static struct led_classdev clevo_mail_led = {
-	.name			= "clevo",
+	.name			= "clevo::mail",
 	.brightness_set		= clevo_mail_led_set,
 };