clk: fixed-rate: add devm_clk_hw_register_fixed_rate

Add devm_clk_hw_register_fixed_rate(), devres-managed helper to register
fixed-rate clock.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20220916061740.87167-3-dmitry.baryshkov@linaro.org


Signed-off-by: Stephen Boyd <sboyd@kernel.org>