arm: bcmbca: replace ARCH_BCM6753 symbols in Kconfig with BCM6855

As CONFIG_ARCH_BCM6753 is replaced with CONFIG_BCM6855, update the
driver Kconfig to use the new config symbol.

Signed-off-by: William Zhang <william.zhang@broadcom.com>
Reviewed-by: Philippe Reynes <philippe.reynes@softathome.com>
diff --git a/drivers/led/Kconfig b/drivers/led/Kconfig
index 98f015a..996b757 100644
--- a/drivers/led/Kconfig
+++ b/drivers/led/Kconfig
@@ -30,7 +30,7 @@
 
 config LED_BCM6753
 	bool "LED Support for BCM6753"
-	depends on LED && ARCH_BCM6753
+	depends on LED && BCM6855
 	help
 	  This option enables support for LEDs connected to the BCM6753
 	  HW has blinking and fading capabilities and up to 32 LEDs can be controlled.