sunxi: Enable DM_I2C for all sunxi boards

Now that the last users of legacy I2C (outside of SPL) have been
resolved, we can enable DM_I2C at the sunxi architecture level.

Reviewed-by: Heiko Schocher <hs@denx.de>
Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index ebb1927..d8c041a 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1028,6 +1028,7 @@
 	select DM
 	select DM_ETH
 	select DM_GPIO
+	select DM_I2C if I2C
 	select DM_KEYBOARD
 	select DM_MMC if MMC
 	select DM_SCSI if SCSI