panel/z00t-tm5p5-n35596: Use refcounted allocation in place of devm_kzalloc()

Move to using the new API devm_drm_panel_alloc() to allocate the
panel.

Signed-off-by: Anusha Srivatsa <asrivats@redhat.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20250401-b4-drm-panel-mass-driver-convert-v1-3-cdd7615e1f93@redhat.com


Signed-off-by: Maxime Ripard <mripard@kernel.org>