avr32: types: use <asm-generic/int-*.h> for the avr32 architecture

This modifies <asm-avr32/types.h> to use the <asm-generic/int-*.h>
generic include files.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>