video: rockchip: rk_vop: add rk3288-dp compare string

In the current rk3288.dtsi file the compatible string for
the DisplayPort(DP) node ends with "edp". The string in the
binding ends with "dp" which conflicts with "cdn-dp" as a
search term. Add "rk3288-dp" as compare string to select
vop_id.

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>  # chromebook-jerry
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/drivers/video/rockchip/rk_vop.c b/drivers/video/rockchip/rk_vop.c
index bc98ab6..e21ac7e 100644
--- a/drivers/video/rockchip/rk_vop.c
+++ b/drivers/video/rockchip/rk_vop.c
@@ -307,7 +307,8 @@
 		      __func__, dev_read_name(dev));
 		return -EINVAL;
 	}
-	if (strstr(compat, "edp")) {
+	if (strstr(compat, "edp") ||
+	    strstr(compat, "rk3288-dp")) {
 		vop_id = VOP_MODE_EDP;
 	} else if (strstr(compat, "mipi")) {
 		vop_id = VOP_MODE_MIPI;