drm: bridge: simple-bridge: use devm_drm_bridge_add in probe

simple_bridge_probe() calls drm_bridge_add()
Thus, drm_bridge_remove() must be called in the remove() callback.

If we call devm_drm_bridge_add() instead, then drm_bridge_remove()
will be called automatically at device release, and the remove()
callback is no longer required.

Signed-off-by: Marc Gonzalez <mgonzalez@freebox.fr>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240618-devm-simple-bridge-v1-1-c7ed8a09fcc5@freebox.fr