rockchip: evb_rk3399: init vdd_center regulator

Add vdd_center pwm regulator get_device to
enable this regulator.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Acked-by: Simon Glass <sjg@chromium.org>

board/rockchip/evb_rk3399/evb-rk3399.c

@@ -6,6 +6,7 @@
 #include <common.h>
 #include <dm.h>
 #include <dm/pinctrl.h>
+#include <dm/uclass-internal.h>
 #include <asm/arch/periph.h>
 #include <power/regulator.h>
 
@@ -39,6 +40,11 @@ int board_init(void)
 		goto out;
 	}
 
+	/* rk3399 need init vdd_center to get correct output voltage */
+	ret = regulator_get_by_platname("vdd_center", &regulator);
+	if (ret)
+		debug("%s: Cannot get vdd_center regulator\n", __func__);
+
 	ret = regulator_get_by_platname("vcc5v0_host", &regulator);
 	if (ret) {
 		debug("%s vcc5v0_host init fail! ret %d\n", __func__, ret);