drm/omapdrm: Switch private_obj initialization to atomic_create_state

drm/omapdrm: Switch private_obj initialization to atomic_create_state

The omapdrm driver relies on a drm_private_obj, that is initialized by
allocating and initializing a state, and then passing it to
drm_private_obj_init.

Since we're gradually moving away from that pattern to the more
established one relying on a atomic_create_state implementation, let's
migrate this instance to the new pattern.

Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Link: https://patch.msgid.link/20260224-drm-private-obj-reset-v5-2-5a72f8ec9934@kernel.org
Signed-off-by: Maxime Ripard <mripard@kernel.org>