gpio: bcm6345: allow this driver on ARCH_BCM6858

This IP is also used on some arm SoC, so we allow
to use this driver on arch bcm6858.

Signed-off-by: Philippe Reynes <philippe.reynes@softathome.com>
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index b103180..42b15f7 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -23,7 +23,7 @@
 
 config BCM6345_GPIO
 	bool "BCM6345 GPIO driver"
-	depends on DM_GPIO && ARCH_BMIPS
+	depends on DM_GPIO && (ARCH_BMIPS || ARCH_BCM6858)
 	help
 	  This driver supports the GPIO banks on BCM6345 SoCs.