linkage.h: move from blackfin to common includes

1. Add linkage.h support from blackfin to common include,
   which is a reduced version from Linux.
2. Add architecture part support of linkage.h into blackfin
3. Fix include path of in blackfin related to linkage.h
   due to header file movement.

Signed-off-by: Macpaul Lin <macpaul@andestech.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

include/linux/linkage.h

@@ -0,0 +1,76 @@
+/*
+ * U-boot - linkage.h
+ *
+ * Copyright (c) 2005-2007 Analog Devices Inc.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+ * MA 02110-1301 USA
+ */
+
+#ifndef _LINUX_LINKAGE_H
+#define _LINUX_LINKAGE_H
+
+#include <asm/linkage.h>
+#include <linux/config.h>
+
+#ifdef __cplusplus
+#define CPP_ASMLINKAGE		extern "C"
+#else
+#define CPP_ASMLINKAGE
+#endif
+
+#define asmlinkage CPP_ASMLINKAGE
+
+#define SYMBOL_NAME_STR(X)	#X
+#define SYMBOL_NAME(X)		X
+#ifdef __STDC__
+#define SYMBOL_NAME_LABEL(X)	X##:
+#else
+#define SYMBOL_NAME_LABEL(X)	X:
+#endif
+
+#define __ALIGN .align		4
+#define __ALIGN_STR		".align 4"
+
+#ifdef __ASSEMBLY__
+
+#define ALIGN			__ALIGN
+#define ALIGN_STR		__ALIGN_STR
+
+#define LENTRY(name) \
+	ALIGN; \
+	SYMBOL_NAME_LABEL(name)
+
+#define ENTRY(name) \
+	.globl SYMBOL_NAME(name); \
+	LENTRY(name)
+
+#ifndef END
+#define END(name) \
+	.size name, .-name
+#endif
+
+#ifndef ENDPROC
+#define ENDPROC(name) \
+	.type name, @function; \
+	END(name)
+#endif
+
+#endif
+
+#endif