Update of bit operations primitives in cpu_def.h for h8300-elf-gcc (GCC) 4.3.2.

Update of bit operations primitives in cpu_def.h for h8300-elf-gcc (GCC) 4.3.2.

This version provides more functionality, full array support
for char, short, int, long in clear_bit() and set_bit()
functions and the constrains used for bset and bclr instructions
allows compilation with newer GCC versions.
The fallback "o" case is not fully correct because it allows
register with displacement address but dummy "r" constrains
argument forces to prepare address in register anyway and should
eliminate problematic case. If internal GCC optimization is corrected
"o" case should be removed.

Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>