iio: adc: rockchip: Fix clock initialization sequence

clock_set_rate should be executed after devm_clk_get_enabled.

Fixes: 97ad10bb ("iio: adc: rockchip_saradc: Make use of devm_clk_get_enabled")
Signed-off-by: Simon Xue <xxm@rock-chips.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patch.msgid.link/20250312062016.137821-1-xxm@rock-chips.com


Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>