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-net48xx.c b/drivers/leds/leds-net48xx.c
index 45ba3d4..0543604 100644
--- a/drivers/leds/leds-net48xx.c
+++ b/drivers/leds/leds-net48xx.c
@@ -31,7 +31,7 @@
 }
 
 static struct led_classdev net48xx_error_led = {
-	.name		= "net48xx:error",
+	.name		= "net48xx::error",
 	.brightness_set	= net48xx_error_led_set,
 };