blackfin: ibf-dsp561: remove orphan Blackfin board

This is a Blackfin board that commit ea3310e8 ("Blackfin:
Remove") missed to remove.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

board/ibf-dsp561/Kconfig

-if TARGET_IBF_DSP561
-
-config SYS_BOARD
-	default "ibf-dsp561"
-
-config SYS_CONFIG_NAME
-	default "ibf-dsp561"
-
-endif

board/ibf-dsp561/MAINTAINERS

-IBF-DSP561 BOARD
-M:	I-SYST Micromodule <support@i-syst.com>
-S:	Maintained
-F:	board/ibf-dsp561/
-F:	include/configs/ibf-dsp561.h
-F:	configs/ibf-dsp561_defconfig

board/ibf-dsp561/Makefile

-#
-# U-Boot - Makefile
-#
-# Copyright (c) 2005-2007 Analog Device Inc.
-#
-# (C) Copyright 2000-2006
-# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
-#
-# SPDX-License-Identifier:	GPL-2.0+
-#
-
-obj-y	:= ibf-dsp561.o

board/ibf-dsp561/config.mk

-#
-# Copyright (c) 2005-2008 Analog Device Inc.
-#
-# (C) Copyright 2001
-# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
-#
-# SPDX-License-Identifier:	GPL-2.0+
-#
-
-# Set some default LDR flags based on boot mode.
-LDR_FLAGS-BFIN_BOOT_PARA := --bits 16

board/ibf-dsp561/ibf-dsp561.c

-/*
- * U-Boot - main board file
- *
- * Copyright (c) 2008-2009 I-SYST.
- *
- * Licensed under the GPL-2 or later.
- */
-
-#include <common.h>
-#include <netdev.h>
-
-DECLARE_GLOBAL_DATA_PTR;
-
-int checkboard(void)
-{
-	printf("Board: I-SYST IBF-DSP561 Micromodule\n");
-	printf("       Support: http://www.i-syst.com/\n");
-	return 0;
-}
-
-#ifdef CONFIG_DRIVER_AX88180
-int board_eth_init(bd_t *bis)
-{
-	return ax88180_initialize(bis);
-}
-#endif