drm/omap: omap_irq: Fix a couple of doc-rot issues

The API has been updated, but the header was not.

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

drivers/gpu/drm/omapdrm/omap_irq.c:115: warning: Function parameter or member 'crtc' not described in 'omap_irq_enable_vblank'
drivers/gpu/drm/omapdrm/omap_irq.c:115: warning: Excess function parameter 'dev' description in 'omap_irq_enable_vblank'
drivers/gpu/drm/omapdrm/omap_irq.c:115: warning: Excess function parameter 'pipe' description in 'omap_irq_enable_vblank'
drivers/gpu/drm/omapdrm/omap_irq.c:142: warning: Function parameter or member 'crtc' not described in 'omap_irq_disable_vblank'
drivers/gpu/drm/omapdrm/omap_irq.c:142: warning: Excess function parameter 'dev' description in 'omap_irq_disable_vblank'
drivers/gpu/drm/omapdrm/omap_irq.c:142: warning: Excess function parameter 'pipe' description in 'omap_irq_disable_vblank'

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

drivers/gpu/drm/omapdrm/omap_irq.c

···
 
 /**
  * enable_vblank - enable vblank interrupt events
- * @dev: DRM device
- * @pipe: which irq to enable
+ * @crtc: DRM CRTC
  *
  * Enable vblank interrupts for @crtc.  If the device doesn't have
  * a hardware vblank counter, this routine should be a no-op, since
···
 
 /**
  * disable_vblank - disable vblank interrupt events
- * @dev: DRM device
- * @pipe: which irq to enable
+ * @crtc: DRM CRTC
  *
  * Disable vblank interrupts for @crtc.  If the device doesn't have
  * a hardware vblank counter, this routine should be a no-op, since