drm/msm/dp/dp_link: Fix some potential doc-rot

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/msm/dp/dp_link.c:374: warning: expecting prototype for dp_parse_video_pattern_params(). Prototype was for dp_link_parse_video_pattern_params() instead
 drivers/gpu/drm/msm/dp/dp_link.c:573: warning: expecting prototype for dp_parse_phy_test_params(). Prototype was for dp_link_parse_phy_test_params() instead
 drivers/gpu/drm/msm/dp/dp_link.c:975: warning: expecting prototype for dp_link_process_downstream_port_status_change(). Prototype was for dp_link_process_ds_port_status_change() instead

Cc: Rob Clark <robdclark@gmail.com>
Cc: Sean Paul <sean@poorly.run>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Chandan Uddaraju <chandanu@codeaurora.org>
Cc: Kuogee Hsieh <khsieh@codeaurora.org>
Cc: linux-arm-msm@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: freedreno@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20210602143300.2330146-15-lee.jones@linaro.orgReviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/dp/dp_link.c

@@ -364,7 +364,7 @@ static int dp_link_parse_timing_params3(struct dp_link_private *link,
 }
 
 /**
- * dp_parse_video_pattern_params() - parses video pattern parameters from DPCD
+ * dp_link_parse_video_pattern_params() - parses video pattern parameters from DPCD
  * @link: Display Port Driver data
  *
  * Returns 0 if it successfully parses the video link pattern and the link
@@ -563,7 +563,7 @@ static int dp_link_parse_link_training_params(struct dp_link_private *link)
 }
 
 /**
- * dp_parse_phy_test_params() - parses the phy link parameters
+ * dp_link_parse_phy_test_params() - parses the phy link parameters
  * @link: Display Port Driver data
  *
  * Parses the DPCD (Byte 0x248) for the DP PHY link pattern that is being
@@ -952,7 +952,7 @@ static int dp_link_process_link_status_update(struct dp_link_private *link)
 }
 
 /**
- * dp_link_process_downstream_port_status_change() - process port status changes
+ * dp_link_process_ds_port_status_change() - process port status changes
  * @link: Display Port Driver data
  *
  * This function will handle downstream port updates that are initiated by