[PATCH] DRM: delete DRM IRQ legacy midlayer docs

Remove documentation associated with the removal of the DRM IRQ legacy
midlayer.

Eliminates these documentation warnings:

../drivers/gpu/drm/drm_irq.c:1: warning: 'irq helpers' not found
../drivers/gpu/drm/drm_irq.c:1: warning: no structured comments found

Fixes: c1736b9008cb ("drm: IRQ midlayer is now legacy")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Sam Ravnborg <redacted>
Cc: dri-devel@lists.freedesktop.org
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Cc: David Airlie <redacted>
Cc: Daniel Vetter <redacted>
---
 Documentation/gpu/drm-internals.rst |    9 ---------
 1 file changed, 9 deletions(-)

--- lnx-515-rc4.orig/Documentation/gpu/drm-internals.rst
+++ lnx-515-rc4/Documentation/gpu/drm-internals.rst

@@ -111,15 +111,6 @@ Component Helper Usage
 .. kernel-doc:: drivers/gpu/drm/drm_drv.c
    :doc: component helper usage recommendations
 
-IRQ Helper Library
-~~~~~~~~~~~~~~~~~~
-
-.. kernel-doc:: drivers/gpu/drm/drm_irq.c
-   :doc: irq helpers
-
-.. kernel-doc:: drivers/gpu/drm/drm_irq.c
-   :export:
-
 Memory Manager Initialization
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~