[U-Boot] ARM: stm32f7: fix prescaler calculation of timer

[Tom Rini]

On Mon, Oct 02, 2017 at 10:47:59PM -0700, Bo Shen wrote:

> As the timer 2 is on APB1 bus, the maximum of clock frequency of APB1 timer
> clock is half of SYSCLK. Then to calculate the timer prescaler for timer 2
> which need to be divided by 2.
> 
> Signed-off-by: Bo Shen <voice.shen at gmail.com>
> Reviewed-by: Vikas Manocha <vikas.manocha at st.com>

Applied to u-boot/master, thanks!

-- 
Tom
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