staging: iio: resolver: ad2s1210: clear faults after soft reset

staging: iio: resolver: ad2s1210: clear faults after soft reset

When a software reset is performed on the AD2S1210 to make the selected
excitation frequency take effect, it always triggers faults on the
input signals because the output signal is interrupted momentarily.
So we need to clear the faults after the software reset to avoid
triggering fault events the next time a sample is read.

The datasheet specifies a time t[track] in Table 27 that specifies the
settle time in milliseconds after a reset depending on the selected
resolution. This is used in the driver to add an appropriate delay.

Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://lore.kernel.org/r/20231010-ad2s1210-mainline-v5-2-35a0f6ffa04a@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>