integrator: switch to DM serial port

This switches the Integrator boards over to using the device model
for its serial ports.

Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index f2eb09f..a436e81 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -458,6 +458,8 @@
 
 config ARCH_INTEGRATOR
 	bool "ARM Ltd. Integrator family"
+	select DM
+	select DM_SERIAL
 
 config ARCH_KEYSTONE
 	bool "TI Keystone"