iio: adc: spear_adc: Use device managed 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.

Switch to devm_iio_device_register() and drop the remove function.

This simplifies the code.

Signed-off-by: Jinjie Ruan <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jonathan Cameron <[email protected]>

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