ARM: zynq: Change zc770 xm011 Nand x16 configurations

Instead of symlink include origin file and just change model description.
Difference is not in DT but in ps7_init configurations which is taken based
on device tree name that's why the same DT can't be used.

Also update model and update comments to match configurations.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>

arch/arm/dts/zynq-zc770-xm011-x16.dts

@@ -1 +0,0 @@
-zynq-zc770-xm011.dts

arch/arm/dts/zynq-zc770-xm011-x16.dts

@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Xilinx ZC770 XM011 board DTS with NAND x16
+ *
+ * Copyright (C) 2013-2018 Xilinx, Inc.
+ */
+#include "zynq-zc770-xm011.dts"
+
+/ {
+	model = "Xilinx ZC770 XM011 board (NAND x16)";
+};

arch/arm/dts/zynq-zc770-xm011.dts

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
- * Xilinx ZC770 XM013 board DTS
+ * Xilinx ZC770 XM011 board DTS
  *
  * Copyright (C) 2013-2018 Xilinx, Inc.
  */