ARM: dts: socfpga: enable arm,shared-override in the pl310

Enable the bit(22) shared-override bit for the SoCFPGA family. While at it,
enable the prefetch-data and prefetch-instr settings for the Arria10.
Signed-off-by: Dinh Nguyen <dinguyen@opensource.altera.com>

arch/arm/boot/dts/socfpga.dtsi

@@ -686,6 +686,7 @@ L2: l2-cache@fffef000 {
 			arm,data-latency = <2 1 1>;
 			prefetch-data = <1>;
 			prefetch-instr = <1>;
+			arm,shared-override;
 		};
 
 		mmc: dwmmc0@ff704000 {

arch/arm/boot/dts/socfpga_arria10.dtsi

@@ -573,6 +573,9 @@ L2: l2-cache@fffff000 {
 			interrupts = <0 18 IRQ_TYPE_LEVEL_HIGH>;
 			cache-unified;
 			cache-level = <2>;
+			prefetch-data = <1>;
+			prefetch-instr = <1>;
+			arm,shared-override;
 		};
 
 		mmc: dwmmc0@ff808000 {