sparc, sparc64: use arch/sparc/include

The majority of this patch was created by the following script:

***
ASM=arch/sparc/include/asm
mkdir -p $ASM
git mv include/asm-sparc64/ftrace.h $ASM
git rm include/asm-sparc64/*
git mv include/asm-sparc/* $ASM
sed -ie 's/asm-sparc64/asm/g' $ASM/*
sed -ie 's/asm-sparc/asm/g' $ASM/*
***

The rest was an update of the top-level Makefile to use sparc
for header files when sparc64 is being build.
And a small fixlet to pick up the correct unistd.h from
sparc64 code.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

include/asm-sparc/elf.h → arch/sparc/include/asm/elf.h

 #ifndef ___ASM_SPARC_ELF_H
 #define ___ASM_SPARC_ELF_H
 #if defined(__sparc__) && defined(__arch64__)
-#include <asm-sparc/elf_64.h>
+#include <asm/elf_64.h>
 #else
-#include <asm-sparc/elf_32.h>
+#include <asm/elf_32.h>
 #endif
 #endif

include/asm-sparc/floppy.h → arch/sparc/include/asm/floppy.h

 #ifndef ___ASM_SPARC_FLOPPY_H
 #define ___ASM_SPARC_FLOPPY_H
 #if defined(__sparc__) && defined(__arch64__)
-#include <asm-sparc/floppy_64.h>
+#include <asm/floppy_64.h>
 #else
-#include <asm-sparc/floppy_32.h>
+#include <asm/floppy_32.h>
 #endif
 #endif

include/asm-sparc/floppy_32.h → arch/sparc/include/asm/floppy_32.h

-/* asm-sparc/floppy.h: Sparc specific parts of the Floppy driver.
+/* asm/floppy.h: Sparc specific parts of the Floppy driver.
  *
  * Copyright (C) 1995 David S. Miller (davem@davemloft.net)
  */