Exynos: Make sure ps_hold gets set in the SPL

Setting ps_hold ought to be one of the first things we do when we
first boot up. If we wait until the main u-boot runs we won't set it
in time and the PMIC may power us back off.

Signed-off-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Akshay Saraswat <akshay.s@samsung.com>
Acked-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

arch/arm/include/asm/arch-exynos/power.h

@@ -1726,4 +1726,5 @@ uint32_t get_reset_status(void);
 
 /* Read the resume function and call it */
 void power_exit_wakeup(void);
+
 #endif