rockchip: video: Take the vop device out of standby

On reset the standby bit is clear, but if U-Boot is chain-loaded from
another boot loader it may be set. Clear it before starting up video so
that it works correctly.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Anatolij Gustschin <agust@denx.de>
Squashed in 'rockchip: video: fix taking the VOP device out of standby':
Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>

drivers/video/rockchip/rk_vop.c

@@ -105,6 +105,9 @@ static void rkvop_enable_output(struct udevice *dev, enum vop_modes mode)
 	struct rk_vop_priv *priv = dev_get_priv(dev);
 	struct rk3288_vop *regs = priv->regs;
 
+	/* remove from standby */
+	clrbits_le32(&regs->sys_ctrl, V_STANDBY_EN(1));
+
 	switch (mode) {
 	case VOP_MODE_HDMI:
 		clrsetbits_le32(&regs->sys_ctrl, M_ALL_OUT_EN,