drm/omap: Fix kernel docs

Fix doc related warnings seen with W=1: the function names have changed
but the docs have not been changed accordingly.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220916082206.167427-2-tomi.valkeinen@ideasonboard.comReviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

drivers/gpu/drm/omapdrm/omap_gem.c

@@ -605,7 +605,7 @@ int omap_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
 }
 
 /**
- * omap_gem_dumb_map	-	buffer mapping for dumb interface
+ * omap_gem_dumb_map_offset - create an offset for a dumb buffer
  * @file: our drm client file
  * @dev: drm device
  * @handle: GEM handle to the object (from dumb_create)

drivers/gpu/drm/omapdrm/omap_irq.c

@@ -99,7 +99,7 @@ int omap_irq_enable_framedone(struct drm_crtc *crtc, bool enable)
 }
 
 /**
- * enable_vblank - enable vblank interrupt events
+ * omap_irq_enable_vblank - enable vblank interrupt events
  * @crtc: DRM CRTC
  *
  * Enable vblank interrupts for @crtc.  If the device doesn't have
@@ -129,7 +129,7 @@ int omap_irq_enable_vblank(struct drm_crtc *crtc)
 }
 
 /**
- * disable_vblank - disable vblank interrupt events
+ * omap_irq_disable_vblank - disable vblank interrupt events
  * @crtc: DRM CRTC
  *
  * Disable vblank interrupts for @crtc.  If the device doesn't have