arm64: zynqmp: Remove fixme about memory size on zynqmp-p-a2197

System controller has 2GB of memory and fixme can be removed now.
Signed-off-by: NMichal Simek <michal.simek@xilinx.com>

arch/arm/dts/zynqmp-p-a2197-00-revA.dts

@@ -41,7 +41,7 @@
 
 	memory@0 {
 		device_type = "memory";
-		reg = <0x0 0x0 0x0 0x80000000>; /* FIXME don't know how big memory is there */
+		reg = <0x0 0x0 0x0 0x80000000>;
 	};
 };