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>

arch/sparc/include/asm/shmparam_64.h

@@ -0,0 +1,10 @@
+#ifndef _ASMSPARC64_SHMPARAM_H
+#define _ASMSPARC64_SHMPARAM_H
+
+#include <asm/spitfire.h>
+
+#define __ARCH_FORCE_SHMLBA	1
+/* attach addr a multiple of this */
+#define	SHMLBA	((PAGE_SIZE > L1DCACHE_SIZE) ? PAGE_SIZE : L1DCACHE_SIZE)
+
+#endif /* _ASMSPARC64_SHMPARAM_H */