dm: sunxi: Move driver model CONFIGs to Kconfig

Remove driver model CONFIGs from the board config headers and use Kconfig
instead.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
diff --git a/configs/Linksprite_pcDuino3_fdt_defconfig b/configs/Linksprite_pcDuino3_fdt_defconfig
index 3b6dfa6..cfed375 100644
--- a/configs/Linksprite_pcDuino3_fdt_defconfig
+++ b/configs/Linksprite_pcDuino3_fdt_defconfig
@@ -2,6 +2,8 @@
 CONFIG_SYS_EXTRA_OPTIONS="AXP209_POWER,SUNXI_GMAC,AHCI,SATAPWR=SUNXI_GPH(2),USB_EHCI"
 CONFIG_FDTFILE="sun7i-a20-pcduino3.dtb"
 CONFIG_DM=y
+CONFIG_DM_GPIO=y
+CONFIG_DM_SERIAL=y
 CONFIG_DEFAULT_DEVICE_TREE="sun7i-a20-pcduino3"
 CONFIG_OF_CONTROL=y
 CONFIG_OF_SEPARATE=y