drm/i915/gem/i915_gem_domain: Provide function names to complete proper kerneldoc

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

 drivers/gpu/drm/i915/gem/i915_gem_domain.c:119: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
 drivers/gpu/drm/i915/gem/i915_gem_domain.c:180: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
 drivers/gpu/drm/i915/gem/i915_gem_domain.c:265: warning: expecting prototype for Changes the cache(). Prototype was for i915_gem_object_set_cache_level() instead
 drivers/gpu/drm/i915/gem/i915_gem_domain.c:470: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
 drivers/gpu/drm/i915/gem/i915_gem_domain.c:514: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: David Airlie <airlied@gmail.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: intel-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee@kernel.org>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230331092607.700644-9-lee@kernel.org

drivers/gpu/drm/i915/gem/i915_gem_domain.c

@@ -115,7 +115,8 @@ void i915_gem_object_flush_if_display_locked(struct drm_i915_gem_object *obj)
 }
 
 /**
- * Moves a single object to the WC read, and possibly write domain.
+ * i915_gem_object_set_to_wc_domain - Moves a single object to the WC read, and
+ *                                    possibly write domain.
  * @obj: object to act on
  * @write: ask for write access or read only
  *
@@ -176,7 +177,8 @@ i915_gem_object_set_to_wc_domain(struct drm_i915_gem_object *obj, bool write)
 }
 
 /**
- * Moves a single object to the GTT read, and possibly write domain.
+ * i915_gem_object_set_to_gtt_domain - Moves a single object to the GTT read,
+ *                                     and possibly write domain.
  * @obj: object to act on
  * @write: ask for write access or read only
  *
@@ -245,7 +247,7 @@ i915_gem_object_set_to_gtt_domain(struct drm_i915_gem_object *obj, bool write)
 }
 
 /**
- * Changes the cache-level of an object across all VMA.
+ * i915_gem_object_set_cache_level - Changes the cache-level of an object across all VMA.
  * @obj: object to act on
  * @cache_level: new cache level to set for the object
  *
@@ -466,7 +468,8 @@ i915_gem_object_pin_to_display_plane(struct drm_i915_gem_object *obj,
 }
 
 /**
- * Moves a single object to the CPU read, and possibly write domain.
+ * i915_gem_object_set_to_cpu_domain - Moves a single object to the CPU read,
+ *                                     and possibly write domain.
  * @obj: object to act on
  * @write: requesting write or read-only access
  *
@@ -510,7 +513,8 @@ i915_gem_object_set_to_cpu_domain(struct drm_i915_gem_object *obj, bool write)
 }
 
 /**
- * Called when user space prepares to use an object with the CPU, either
+ * i915_gem_set_domain_ioctl - Called when user space prepares to use an
+ *                             object with the CPU, either
  * through the mmap ioctl's mapping or a GTT mapping.
  * @dev: drm device
  * @data: ioctl data blob