arm: samsung: Convert s5p_goni and smdkc100 to DM_I2C

These are the last two samsung boards that don't use DM_I2C. Move them
over, leaving #ifdefs to allow the maintainer to complete this work.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Heiko Schocher <hs@denx.de>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index f011026..de4bf83 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -419,6 +419,7 @@
 	select DM
 	select DM_SERIAL
 	select DM_GPIO
+	select DM_I2C
 
 config ARCH_HIGHBANK
 	bool "Calxeda Highbank"