cros, drm: fix errata to set src_y of plane to drm atomic

TEST=run chrome on youtube using eve
BUG=743277

Change-Id: Ie096276779faafed71309372d4fa44ac07054c20
Reviewed-on: https://chromium-review.googlesource.com/581880
Commit-Queue: Dongseong Hwang <dongseong.hwang@intel.com>
Reviewed-by: Dongseong Hwang <dongseong.hwang@intel.com>
Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488783}

ui/ozone/platform/drm/gpu/hardware_display_plane_atomic.cc

@@ -113,7 +113,7 @@ bool HardwareDisplayPlaneAtomic::SetPlaneData(
       drmModeAtomicAddProperty(property_set, plane_id_, src_x_prop_.id,
                                src_rect.x()) &&
       drmModeAtomicAddProperty(property_set, plane_id_, src_y_prop_.id,
-                               src_rect.x()) &&
+                               src_rect.y()) &&
       drmModeAtomicAddProperty(property_set, plane_id_, src_w_prop_.id,
                                src_rect.width()) &&
       drmModeAtomicAddProperty(property_set, plane_id_, src_h_prop_.id,