iio: dac: ad7293: enable power before reset

Change the order of regulator enable and reset so that power supplies
are turned on before touching the reset line. Generally, chips should
have the VDRIVE supply enabled before applying voltage on any pins.

While we are at it, remove the voltage level checks. If the power
supplies are not supplying the correct voltage, this is a hardware
design problem, not a software problem.

Signed-off-by: David Lechner <dlechner@baylibre.com>
Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Link: https://patch.msgid.link/20241216-iio-regulator-cleanup-round-6-v2-1-9482164b68cb@baylibre.com


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