ARM: dts: OMAP: Add #hwlock-cells property to hwspinlock nodes

Add a new generic property "#hwlock-cells" to the hwspinlock
DT nodes on OMAP4, OMAP5 and AM33xx. This common property allows
different platform implementations to define the args specifier
length. OMAP implementations will always use a value of 1.

Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am33xx.dtsi

@@ -318,6 +318,7 @@
 			compatible = "ti,omap4-hwspinlock";
 			reg = <0x480ca000 0x1000>;
 			ti,hwmods = "spinlock";
+			#hwlock-cells = <1>;
 		};
 
 		wdt2: wdt@44e35000 {

arch/arm/boot/dts/omap4.dtsi

@@ -313,6 +313,7 @@
 			compatible = "ti,omap4-hwspinlock";
 			reg = <0x4a0f6000 0x1000>;
 			ti,hwmods = "spinlock";
+			#hwlock-cells = <1>;
 		};
 
 		i2c1: i2c@48070000 {

arch/arm/boot/dts/omap5.dtsi

@@ -353,6 +353,7 @@
 			compatible = "ti,omap4-hwspinlock";
 			reg = <0x4a0f6000 0x1000>;
 			ti,hwmods = "spinlock";
+			#hwlock-cells = <1>;
 		};
 
 		mcspi1: spi@48098000 {