drm/dp_mst: Lower down debug info level when receive NAK

[Why]
It's reasonable that we receive NAK while doing DP_REMOTE_DPCD_READ.
Downstream device might reply NAK with the reason and source should
react accordingly.

e.g.
1. When downstream device can't handle corresponding message in time,
it then replies NAK as reason been set as DEFER.
2. When multi-function branch-sink device doesn't enumerate virtual
DP peer devices for those multi-function down facing ports. Without
virtual DPCD, branch device might reply NAK with reason as BAD_PARAM
indicating this port can't do aux DPCD read.

It's expected result. Not an error.

[How]
Use drm_dbg_kms() to replace drm_err() when receive NAK.

Changes since v1:
* drm_dp_mst_topology.c file path changed. Folder was rename from
 'dp' to 'display'
Signed-off-by: Wayne Lin <Wayne.Lin@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
[fixed some indenting issues]
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220428124944.1683680-1-Wayne.Lin@amd.com

drivers/gpu/drm/display/drm_dp_mst_topology.c

@@ -3557,10 +3557,9 @@ static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr,
 	if (ret < 0)
 		goto fail_free;
 
-	/* DPCD read should never be NACKed */
 	if (txmsg->reply.reply_type == 1) {
-		drm_err(mgr->dev, "mstb %p port %d: DPCD read on addr 0x%x for %d bytes NAKed\n",
-			mstb, port->port_num, offset, size);
+		drm_dbg_kms(mgr->dev, "mstb %p port %d: DPCD read on addr 0x%x for %d bytes NAKed\n",
+			    mstb, port->port_num, offset, size);
 		ret = -EIO;
 		goto fail_free;
 	}