arm64: zynqmp: Add revB string to compatible string

Some user space libraries reading platform compatible string and based
on that changing behavior. Mark revB board with revB string.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/arch/arm/dts/zynqmp-zcu102-revB.dts b/arch/arm/dts/zynqmp-zcu102-revB.dts
index 8233733..c771a94 100644
--- a/arch/arm/dts/zynqmp-zcu102-revB.dts
+++ b/arch/arm/dts/zynqmp-zcu102-revB.dts
@@ -12,6 +12,7 @@
 
 / {
 	model = "ZynqMP ZCU102 RevB";
+	compatible = "xlnx,zynqmp-zcu102-revB", "xlnx,zynqmp-zcu102", "xlnx,zynqmp";
 };
 
 &gem3 {