drm/gma500/cdv_intel_lvds: Demote unworthy headers to standard blocks and fix another

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

 drivers/gpu/drm/gma500/cdv_intel_lvds.c:83: warning: Function parameter or member 'dev' not described in 'cdv_intel_lvds_set_backlight'
 drivers/gpu/drm/gma500/cdv_intel_lvds.c:83: warning: Function parameter or member 'level' not described in 'cdv_intel_lvds_set_backlight'
 drivers/gpu/drm/gma500/cdv_intel_lvds.c:107: warning: Function parameter or member 'dev' not described in 'cdv_intel_lvds_set_power'
 drivers/gpu/drm/gma500/cdv_intel_lvds.c:107: warning: Function parameter or member 'encoder' not described in 'cdv_intel_lvds_set_power'
 drivers/gpu/drm/gma500/cdv_intel_lvds.c:107: warning: Function parameter or member 'on' not described in 'cdv_intel_lvds_set_power'
 drivers/gpu/drm/gma500/cdv_intel_lvds.c:298: warning: Function parameter or member 'connector' not described in 'cdv_intel_lvds_get_modes'
 drivers/gpu/drm/gma500/cdv_intel_lvds.c:480: warning: Function parameter or member 'mode_dev' not described in 'cdv_intel_lvds_init'

Cc: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Eric Anholt <eric@anholt.net>
Cc: Jesse Barnes <jesse.barnes@intel.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/20210115181601.3432599-17-lee.jones@linaro.org

drivers/gpu/drm/gma500/cdv_intel_lvds.c

@@ -74,7 +74,7 @@ static u32 cdv_intel_lvds_get_max_backlight(struct drm_device *dev)
 	return retval;
 }
 
-/**
+/*
  * Sets the backlight level.
  *
  * level backlight level, from 0 to cdv_intel_lvds_get_max_backlight().
@@ -99,7 +99,7 @@ static void cdv_intel_lvds_set_backlight(struct drm_device *dev, int level)
 	}
 }
 
-/**
+/*
  * Sets the power state for the panel.
  */
 static void cdv_intel_lvds_set_power(struct drm_device *dev,
@@ -291,7 +291,7 @@ static void cdv_intel_lvds_mode_set(struct drm_encoder *encoder,
 	REG_WRITE(PFIT_CONTROL, pfit_control);
 }
 
-/**
+/*
  * Return the list of DDC modes if available, or the BIOS fixed mode otherwise.
  */
 static int cdv_intel_lvds_get_modes(struct drm_connector *connector)
@@ -471,6 +471,7 @@ static bool lvds_is_present_in_vbt(struct drm_device *dev,
 /**
  * cdv_intel_lvds_init - setup LVDS connectors on this device
  * @dev: drm device
+ * @mode_dev: PSB mode device
  *
  * Create the connector, register the LVDS DDC bus, and try to figure out what
  * modes we can display on the LVDS panel (if present).