spi: dw-mmio: Use helper function devm_clk_get_*()

Since commit 7ef9651e9792 ("clk: Provide new devm_clk helpers for prepared
and enabled clocks"), devm_clk_get() and clk_prepare_enable() can now be
replaced by devm_clk_get_enabled() when driver enables (and possibly
prepares) the clocks for the whole lifetime of the device. Moreover, it is
no longer necessary to unprepare and disable the clocks explicitly. Also,
devm_clk_get_optional() and clk_prepare_enable() can now be replaced by
devm_clk_get_optional_enabled(). Moreover, the lable "out_clk" no longer
makes sense, rename it to "out_reset".

Signed-off-by: Li Zetao <lizetao1@huawei.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Serge Semin <fancer.lancer@gmail.com>
Link: https://lore.kernel.org/r/20230823133938.1359106-13-lizetao1@huawei.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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