move the BRx_* and ORx_* left behind in mpc85xx.h 

The same is needed for mpc8xx.h and mpc8260.h (defines are almost
the same, just few differences which needs some attention though).

But the bad news for mpc8xx and mpc8260 is that there are a lot of users
of these defines. So this cleanup I'll leave for the "better times".

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>