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>
diff --git a/arch/arm/boot/dts/omap5.dtsi b/arch/arm/boot/dts/omap5.dtsi
index a72813a..ea5f220 100644
--- a/arch/arm/boot/dts/omap5.dtsi
+++ b/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 {