board: pm9g45: Migrate to CONFIG_DM

Migrate the following options to CONFIG_DM:
  CONFIG_DM_GPIO
  CONFIG_DM_MMC
  CONFIG_DM_ETH
  CONFIG_DM_SERIAL
  CONFIG_DM_USB

Signed-off-by: Ilko Iliev <iliev@ronetix.at>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 0e2ffdb..e148e96 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -598,6 +598,8 @@
 
 dtb-$(CONFIG_TARGET_AT91SAM9M10G45EK) += at91sam9m10g45ek.dtb
 
+dtb-$(CONFIG_TARGET_PM9G45) += at91sam9m10g45ek.dtb
+
 dtb-$(CONFIG_TARGET_AT91SAM9X5EK) += \
 	at91sam9g15ek.dtb	\
 	at91sam9g25ek.dtb	\