ARM: dts: mmp3: Add a name to /clocks node

It should have one and DTC is indeed unhappy about its absence:

  <stdout>: Warning (unit_address_vs_reg): /soc/clocks: node has a reg or
  ranges property, but no unit name

Link: https://lore.kernel.org/r/20191031163455.1711872-2-lkundrak@v3.skSigned-off-by: Lubomir Rintel <lkundrak@v3.sk>
Signed-off-by: Olof Johansson <olof@lixom.net>

arch/arm/boot/dts/mmp3.dtsi

@@ -486,7 +486,7 @@ l2: l2-cache-controller@d0020000 {
 			cache-level = <2>;
 		};
 
-		soc_clocks: clocks {
+		soc_clocks: clocks@d4050000 {
 			compatible = "marvell,mmp2-clock";
 			reg = <0xd4050000 0x1000>,
 			      <0xd4282800 0x400>,