Replace #x with __stringify(x).
Also, #ifndef __STR is removed and undefine __STR macro at the beginning.

The __STR() macro is still remained, because the assembler.h might be
included from assembly codes as well as C codes.
Signed-off-by: NHirokazu Takata <takata@linux-m32r.org>

Move remained files, ftrace.h and swab.h, to arch/m32r/include/asm/.
Signed-off-by: NHirokazu Takata <takata@linux-m32r.org>

Signed-off-by: NHirokazu Takata <takata@linux-m32r.org>