iio: adc: mt6577_auxadc: Use devm_clk_get_enabled() helper function

The devm_clk_get_enabled() helper:
    - calls devm_clk_get()
    - calls clk_prepare_enable() and registers what is needed in order to
      call clk_disable_unprepare() when needed, as a managed resource.

This simplifies the code.

Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Link: https://lore.kernel.org/r/20230825105746.2999548-3-ruanjinjie@huawei.com


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>