drm: Fix oops in damage self-tests by mocking damage property

I've added a new check to make sure that drivers which insepct the
damage property have it set up correctly, but somehow missed that this
borke the damage selftest in the CI result noise.

Fix it up by mocking enough of drm_device and drm_plane so we can call
drm_plane_enable_fb_damage_clips() to make the new check happy.

Since there's a lot of duplicated mock code already copy-pasted into
each test I've also refactored this a bit to trim it down.

v2: Squash in fixup from 0day for

drivers/gpu/drm/selftests/test-drm_damage_helper.c:15:19: warning: symbol 'mock_device' was not declared. Should it be static?
drivers/gpu/drm/selftests/test-drm_damage_helper.c:16:30: warning: symbol 'mock_obj_props' was not declared. Should it be static?
drivers/gpu/drm/selftests/test-drm_damage_helper.c:17:18: warning: symbol 'mock_plane' was not declared. Should it be static?
drivers/gpu/drm/selftests/test-drm_damage_helper.c:18:21: warning: symbol 'mock_prop' was not declared. Should it be static?

Reported-by: kernel test robot <[email protected]>
Signed-off-by: kernel test robot <[email protected]>

Reviewed-by: Maarten Lankhorst <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Fixes: c7fcbf2 ("drm/plane: check that fb_damage is set up when used")
Cc: José Roberto de Souza <[email protected]> (v1)
Cc: Ville Syrjälä <[email protected]>
Cc: Gwan-gyeong Mun <[email protected]>
Cc: José Roberto de Souza <[email protected]>
Cc: Hans de Goede <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Maxime Ripard <[email protected]>
Cc: Thomas Zimmermann <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Link: https://patchwork.freedesktop.org/patch/msgid/20210730141948.GA11955@243d74413310

Author: danvet