linux-imx

drm/ati_pcigart: drop dependency on drm_os_linux.h

The drm_os_linux.h header is deprecated.
Just opencode the sole DRM_WRITE32().

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Sean Paul <sean@poorly.run>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <maxime.ripard@bootlin.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20190718161507.2047-5-sam@ravnborg.org