drm: Include <drm/drm_auth.h>

One of the source files includes <drm/drm_auth.h> via <drm/drm_legacy.h>,
which will be removed. Include drm_auth.h directly.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: David Airlie <airlied@gmail.com>
Reviewed-by: Daniel Vetter <daniel@ffwll.ch>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231122122449.11588-4-tzimmermann@suse.de

drivers/gpu/drm/drm_pci.c

@@ -29,6 +29,7 @@
 #include <linux/pci.h>
 #include <linux/slab.h>
 
+#include <drm/drm_auth.h>
 #include <drm/drm.h>
 #include <drm/drm_drv.h>
 #include <drm/drm_print.h>