iio: ad4310: Replace devm_clk_register() with devm_clk_hw_register()

iio: ad4310: Replace devm_clk_register() with devm_clk_hw_register()

The devm_clk_register() is deprecated and devm_clk_hw_register() should be
used as a replacement.

Switching to the clk_hw interface also allows to use the built-in device
managed version of registering the clock provider. The non-clk_hw interface
does not have a device managed version.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20230910140903.551081-1-lars@metafoo.de
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>