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/mach-integrator/Kconfig b/arch/arm/mach-integrator/Kconfig
index c54d69d..d506ee5 100644
--- a/arch/arm/mach-integrator/Kconfig
+++ b/arch/arm/mach-integrator/Kconfig
@@ -53,4 +53,7 @@
 	default "integratorap" if ARCH_INTEGRATOR_AP
 	default "integratorcp" if ARCH_INTEGRATOR_CP
 
+config SYS_MALLOC_F_LEN
+	default 0x2000
+
 endmenu