leds: Rename leds-cobalt driver

The leds-cobalt driver only supports the Coable Qube series
(not included in Cobalt Raq series).
Rename the driver and update Kconfig/Makefile.

Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
Acked-by: Florian Fainelli <florian.fainelli@telecomint.eu>
Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 4468cb3..9b79bcd 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -87,11 +87,11 @@
 	help
 	  This option enables support for the LEDs on the h1940.
 
-config LEDS_COBALT
-	tristate "LED Support for Cobalt Server front LED"
+config LEDS_COBALT_QUBE
+	tristate "LED Support for the Cobalt Qube series front LED"
 	depends on LEDS_CLASS && MIPS_COBALT
 	help
-	  This option enables support for the front LED on Cobalt Server
+	  This option enables support for the front LED on Cobalt Qube series
 
 config LEDS_GPIO
 	tristate "LED Support for GPIO connected LEDs"