arm: bcmbca: replace ARCH_BCM6858 symbols in Kconfig with BCM6858

As CONFIG_ARCH_BCM6858 is replaced with CONFIG_BCM6858, 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/gpio/Kconfig b/drivers/gpio/Kconfig
index df45bce..a6dd02f 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -111,8 +111,7 @@
 config BCM6345_GPIO
 	bool "BCM6345 GPIO driver"
 	depends on DM_GPIO && (ARCH_BMIPS || BCM6856 || \
-			       ARCH_BCM6858 || BCM63158 || \
-			       ARCH_BCM6753)
+			       BCM6858 || BCM63158 || ARCH_BCM6753)
 	help
 	  This driver supports the GPIO banks on BCM6345 SoCs.