drm/exynos: Set PHYCTRL_ULPS_EXIT to zero

It looks like the downstream driver uses this value as well and
with 0xaf we are seeing instable image with the ADV7535.

Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>

drivers/gpu/drm/bridge/samsung-dsim-imx.c

@@ -32,7 +32,7 @@ static const unsigned int imx8mm_dsim_reg_values[] = {
 	[RESET_TYPE] = DSIM_SWRST,
 	[PLL_TIMER] = 500,
 	[STOP_STATE_CNT] = 0xf,
-	[PHYCTRL_ULPS_EXIT] = 0xaf,
+	[PHYCTRL_ULPS_EXIT] = 0,
 	[PHYCTRL_VREG_LP] = 0,
 	[PHYCTRL_SLEW_UP] = 0,
 	[PHYTIMING_LPX] = 0x06,