m32r: types: use <asm-generic/int-*.h> for the m32r architecture

This modifies <asm-m32r/types.h> to use the <asm-generic/int-*.h>
generic include files.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: Hirokazu Takata <takata@linux-m32r.org>