ARM: dts: stm32f4: Fix DT dtc warnings

This patch fix the following warnings for for stm32f429
evaluation and discovery boards:

unnecessary #address-cells/#size-cells without "ranges" or
child "reg" property
Signed-off-by: NPatrick Delaunay <patrick.delaunay@st.com>
Signed-off-by: NPatrice Chotard <patrice.chotard@st.com>

arch/arm/dts/stm32429i-eval.dts

@@ -72,7 +72,6 @@
 
 	gpio_keys {
 		compatible = "gpio-keys";
-		#address-cells = <1>;
 		#size-cells = <0>;
 		autorepeat;
 		button@0 {

arch/arm/dts/stm32f429-disco.dts

@@ -76,7 +76,6 @@
 
 	gpio_keys {
 		compatible = "gpio-keys";
-		#address-cells = <1>;
 		#size-cells = <0>;
 		autorepeat;
 		button@0 {

arch/arm/dts/stm32f429.dtsi

@@ -259,7 +259,6 @@
 		};
 
 		timers13: timers@40001c00 {
-			#address-cells = <1>;
 			#size-cells = <0>;
 			compatible = "st,stm32-timers";
 			reg = <0x40001C00 0x400>;
@@ -274,7 +273,6 @@
 		};
 
 		timers14: timers@40002000 {
-			#address-cells = <1>;
 			#size-cells = <0>;
 			compatible = "st,stm32-timers";
 			reg = <0x40002000 0x400>;
@@ -542,7 +540,6 @@
 		};
 
 		timers10: timers@40014400 {
-			#address-cells = <1>;
 			#size-cells = <0>;
 			compatible = "st,stm32-timers";
 			reg = <0x40014400 0x400>;
@@ -557,7 +554,6 @@
 		};
 
 		timers11: timers@40014800 {
-			#address-cells = <1>;
 			#size-cells = <0>;
 			compatible = "st,stm32-timers";
 			reg = <0x40014800 0x400>;