drm/gma500/psb_intel_modes: Provide missing descriptions for function param 'adapter'

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

 drivers/gpu/drm/gma500/psb_intel_modes.c:17: warning: Function parameter or member 'adapter' not described in 'psb_intel_ddc_probe'
 drivers/gpu/drm/gma500/psb_intel_modes.c:51: warning: Function parameter or member 'adapter' not described in 'psb_intel_ddc_get_modes'

Cc: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
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/20210115181313.3431493-31-lee.jones@linaro.org

drivers/gpu/drm/gma500/psb_intel_modes.c

@@ -11,7 +11,7 @@
 
 /**
  * psb_intel_ddc_probe
- *
+ * @adapter:   Associated I2C adaptor
  */
 bool psb_intel_ddc_probe(struct i2c_adapter *adapter)
 {
@@ -43,6 +43,7 @@ bool psb_intel_ddc_probe(struct i2c_adapter *adapter)
 /**
  * psb_intel_ddc_get_modes - get modelist from monitor
  * @connector: DRM connector device to use
+ * @adapter:   Associated I2C adaptor
  *
  * Fetch the EDID information from @connector using the DDC bus.
  */