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

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

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: Ralf Baechle <ralf@linux-mips.org>