[POWERPC] add U-Boot bootcount driver.

[Vitaly Bordug]

[...]
> > bootcount at 0x3eb0 {
> >                   device_type = "bootcount";
Clear.

> 
> No device_type.
> 
> >                   compatible = "uboot,bootcount";
> >                   reg = <0x3eb0 0x08>;
> >                  };
> 
> This area should also be in the flattened tree's reserved map.
> 
Can you elaborate this a little bit? I know about the reserved map by
putting -R4 into device tree cmdline which is apparently not enough :)

Thanks,
-Vitaly