drm/i915/atomic: Fixup kerneldoc

drm/i915/atomic: Fixup kerneldoc

drivers/gpu/drm/i915/intel_atomic.c:198: warning: Function parameter or member 'state' not described in 'intel_crtc_destroy_state'
drivers/gpu/drm/i915/intel_atomic.c:222: warning: Function parameter or member 'intel_crtc' not described in 'intel_atomic_setup_scalers'
drivers/gpu/drm/i915/intel_atomic.c:222: warning: Excess function parameter 'crtc' description in 'intel_atomic_setup_scalers'

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20180214134922.28761-1-chris@chris-wilson.co.uk
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>