ARM: dts: omap2: add missing unit name to func_96m_ck

This patch fixes the following DTC warnings for omap2430-sdp.dtb:

"func_96m_ck has a reg or ranges property, but no unit name"
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/omap24xx-clocks.dtsi

@@ -164,7 +164,7 @@ core_ck: core_ck {
 		clock-div = <1>;
 	};
 
-	func_96m_ck: func_96m_ck {
+	func_96m_ck: func_96m_ck@540 {
 		#clock-cells = <0>;
 	};