drm/gma500/cdv_intel_dp: Demote one unworthy header fix another

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

 drivers/gpu/drm/gma500/cdv_intel_dp.c:315: warning: Function parameter or member 'encoder' not described in 'is_edp'
 drivers/gpu/drm/gma500/cdv_intel_dp.c:315: warning: Excess function parameter 'intel_dp' description in 'is_edp'
 drivers/gpu/drm/gma500/cdv_intel_dp.c:1698: warning: Function parameter or member 'connector' not described in 'cdv_intel_dp_detect'
 drivers/gpu/drm/gma500/cdv_intel_dp.c:1698: warning: Function parameter or member 'force' not described in 'cdv_intel_dp_detect'

Cc: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Keith Packard <keithp@keithp.com>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210115181601.3432599-18-lee.jones@linaro.org
Link: https://patchwork.freedesktop.org/patch/msgid/20210115181601.3432599-17-lee.jones@linaro.org

drivers/gpu/drm/gma500/cdv_intel_dp.c

@@ -306,7 +306,7 @@ static uint32_t dp_vswing_premph_table[] = {
 };
 /**
  * is_edp - is the given port attached to an eDP panel (either CPU or PCH)
- * @intel_dp: DP struct
+ * @encoder: GMA encoder struct
  *
  * If a CPU or PCH DP output is attached to an eDP panel, this function
  * will return true, and false otherwise.
@@ -1687,7 +1687,7 @@ static enum drm_connector_status cdv_dp_detect(struct gma_encoder *encoder)
 	return status;
 }
 
-/**
+/*
  * Uses CRT_HOTPLUG_EN and CRT_HOTPLUG_STAT to detect DP connection.
  *
  * \return true if DP port is connected.