ARM: efm32: switch to properly namespaced location property

Since commits:

281ec367bff4 (i2c: efm32: correct namespacing of location property)
d36f47fa8419 (serial: efm32: correct namespacing of location property)
10ed7e9847b6 (spi: efm32: correct namespacing of location property)

(contained in 3.17-rc1) all drivers support the correctly
namespaced location property. So use the better names now.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

arch/arm/boot/dts/efm32gg-dk3750.dts

@@ -26,7 +26,7 @@
 		};
 
 		i2c@4000a000 {
-			efm32,location = <3>;
+			energymicro,location = <3>;
 			status = "ok";
 
 			temp@48 {
@@ -43,7 +43,7 @@
 
 		spi0: spi@4000c000 { /* USART0 */
 			cs-gpios = <&gpio 68 1>; // E4
-			location = <1>;
+			energymicro,location = <1>;
 			status = "ok";
 
 			microsd@0 {
@@ -57,7 +57,7 @@
 
 		spi1: spi@4000c400 { /* USART1 */
 			cs-gpios = <&gpio 51 1>; // D3
-			location = <1>;
+			energymicro,location = <1>;
 			status = "ok";
 
 			ks8851@0 {
@@ -70,7 +70,7 @@
 		};
 
 		uart4: uart@4000e400 { /* UART1 */
-			location = <2>;
+			energymicro,location = <2>;
 			status = "ok";
 		};