drm/gma500: Add compat ioctl

commit 0a97c81a upstream.

Hook up drm_compat_ioctl to support 32-bit userspace on 64-bit kernels.
It turns out that N2600 and N2800 comes with 64-bit enabled. We
previously assumed there where no such systems out there.
Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20161101144315.2955-1-patrik.r.jakobsson@gmail.com
[bwh: Backported to 3.2: adjust filename, indentation]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

drivers/staging/gma500/psb_drv.c

@@ -1185,6 +1185,9 @@ static struct drm_driver driver = {
 		 .open = drm_open,
 		 .release = drm_release,
 		 .unlocked_ioctl = psb_unlocked_ioctl,
+#ifdef CONFIG_COMPAT
+		 .compat_ioctl = drm_compat_ioctl,
+#endif
 		 .mmap = drm_gem_mmap,
 		 .poll = drm_poll,
 		 .fasync = drm_fasync,