dw_apb_timer_of.c: remove parts that were picoxcell-specific

[Jamie Iles]

Hi Pavel,

Apologies for the delay, but this looks good to me.

On Fri, Apr 26, 2013 at 11:43:14PM +0200, Pavel Machek wrote:
> It seems we made a mistake when creating dw_apb_timer_of.c:
> picoxcell sched_clock had parts that were not related to
> dw_apb_timer, yet we moved them to dw_apb_timer_of, and tried to
> use them on socfpga.
> 
> This results in system where user/system time is not measured
> properly, as demonstrated by
>     
>     time dd if=/dev/urandom of=/dev/zero bs=100000 count=100
>     
> So this patch switches sched_clock to hardware that exists on both
> platforms, and adds missing of_node_put() in dw_apb_timer_init().
>     
> Signed-off-by: Pavel Machek <pavel at denx.de>

Acked-by: Jamie Iles <jamie at jamieiles.com>