[POWERPC] Fix duplicate time accounting

[Olof Johansson]

On Mon, Oct 29, 2007 at 01:50:34PM +1100, Paul Mackerras wrote:
> Currently, process user and system times are advancing twice as fast
> as they should because they are being accounted in two places - in the
> generic code and in timer_interrupt.  This fixes it by removing the
> call to account_process_time in timer_interrupt.
> 
> Signed-off-by: Paul Mackerras <paulus at samba.org>

Tested-by: Olof Johansson <olof at lixom.net>

Thanks for fixing it!

-Olof