spmi: hisi-spmi-controller: Use devm_spmi_controller_add()

Convert to the device-managed version of spmi_controller_add() and
delete the unnecessary driver remove callback.

Signed-off-by: Fei Shao <fshao@chromium.org>
Link: https://lore.kernel.org/r/20230824104101.4083400-5-fshao@chromium.org


Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lore.kernel.org/r/20231206231733.4031901-7-sboyd@kernel.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>