ARM: dts: mmp3: Use the MMP3 compatible string for /clocks

Clocks are in fact slightly different on MMP3. In particular, PLL2 is
fixed to a different frequency, there's an extra PLL3, and the GPU
clocks are configured differently.

Link: https://lore.kernel.org/r/20200419171157.672999-15-lkundrak@v3.sk
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Cc: <stable@vger.kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/boot/dts/mmp3.dtsi

@@ -531,7 +531,7 @@
 		};
 
 		soc_clocks: clocks@d4050000 {
-			compatible = "marvell,mmp2-clock";
+			compatible = "marvell,mmp3-clock";
 			reg = <0xd4050000 0x1000>,
 			      <0xd4282800 0x400>,
 			      <0xd4015000 0x1000>;