ARM: mvebu: use improved armada spi device tree compatible name for each SoC

Use the new compatible introduced in order to benefit of a wider and
more accurate range of baud rates to be used.

Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>

arch/arm/boot/dts/armada-xp.dtsi

@@ -85,10 +85,18 @@
 			};
 
 			spi0: spi@10600 {
+				compatible = "marvell,armada-xp-spi",
+						"marvell,orion-spi";
 				pinctrl-0 = <&spi0_pins>;
 				pinctrl-names = "default";
 			};
 
+			spi1: spi@10680 {
+				compatible = "marvell,armada-xp-spi",
+						"marvell,orion-spi";
+			};
+
+
 			i2c0: i2c@11000 {
 				compatible = "marvell,mv78230-i2c", "marvell,mv64xxx-i2c";
 				reg = <0x11000 0x100>;