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 <[e-mail]>
Cc: David Airlie <[e-mail]>
Cc: Daniel Vetter <[e-mail]>
Cc: Jesse Barnes <[e-mail]>
Cc: [e-mail]
Signed-off-by: Lee Jones <[e-mail]>
Signed-off-by: Daniel Vetter <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/gma500/psb_intel_modes.c

···
 
 /**
  * psb_intel_ddc_probe
- *
+ * @adapter:   Associated I2C adaptor
  */
 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.
  */