arm64: zynqmp: Remove empty configuration file

There is no reason to keep empty config file in the tree that's why
remove it.

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

configs/xilinx_zynqmp_zc1751_xm016_dc2_defconfig

 CONFIG_ARM=y
-CONFIG_SYS_CONFIG_NAME="xilinx_zynqmp_zc1751_xm016_dc2"
 CONFIG_ARCH_ZYNQMP=y
 CONFIG_SYS_TEXT_BASE=0x8000000
 CONFIG_SYS_MALLOC_F_LEN=0x8000

include/configs/xilinx_zynqmp_zc1751_xm016_dc2.h

-/* SPDX-License-Identifier: GPL-2.0+ */
-/*
- * Configuration for Xilinx ZynqMP zc1751 XM016 DC2
- *
- * (C) Copyright 2015 Xilinx, Inc.
- * Michal Simek <michal.simek@xilinx.com>
- */
-
-#ifndef __CONFIG_ZYNQMP_ZC1751_XM016_DC2_H
-#define __CONFIG_ZYNQMP_ZC1751_XM016_DC2_H
-
-#include <configs/xilinx_zynqmp.h>
-
-#endif /* __CONFIG_ZYNQMP_ZC1751_XM016_DC2_H */