[U-Boot] keystone2: add wfi in to the core_spin loop

[Tom Rini]

On Wed, Jul 08, 2015 at 11:40:14AM -0400, Vitaly Andrianov wrote:

> When core A turning of core B, via tetris DPSC it places the core
> B DPSC into transitional state. The core B has to execute wfi instruction
> to move its DPSC to the OFF state. This patch add such instruction.
> 
> Signed-off-by: Vitaly Andrianov <vitalya at ti.com>
> Reviewed-by: Tom Rini <trini at konsulko.com>

Applied to u-boot/master, thanks!

-- 
Tom
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