drm/i915: Fix a buch of kerneldoc warnings

Just a bunch of stale kerneldocs generating warnings when
building the docs. Mostly function parameters so not very
useful but still.

v2: Tidy.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1464958937-23344-1-git-send-email-tvrtko.ursulin@linux.intel.com
diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index fe8faf3..2b75b30 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -2448,6 +2448,7 @@
 /**
  * intel_power_domains_init_hw - initialize hardware power domain state
  * @dev_priv: i915 device instance
+ * @resume: Called from resume code paths or not
  *
  * This function initializes the hardware power domain state and enables all
  * power domains using intel_display_set_init_power().