ARM: dts: efm32: remove skeleton.dtsi include and fix unit address warnings

Removale of skeleton.dtsi allows us also to fix the following
warning from the dts compiler:
  Warning (unit_address_vs_reg): Node /memory has a reg or ranges property, but no unit name

by adding proper unit addresses to the memory nodes. Also add missing
device_type to the memory node while at it.

Signed-off-by: Joachim Eastwood <manabian@gmail.com>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

arch/arm/boot/dts/efm32gg.dtsi

@@ -5,11 +5,13 @@
  * http://www.silabs.com/Support%20Documents/TechnicalDocs/EFM32GG-RM.pdf
  */
 
-#include "skeleton.dtsi"
 #include "armv7-m.dtsi"
 #include "dt-bindings/clock/efm32-cmu.h"
 
 / {
+	#address-cells = <1>;
+	#size-cells = <1>;
+
 	aliases {
 		i2c0 = &i2c0;
 		i2c1 = &i2c1;