staging:iio:cdc:ad7150: Timeout register covers both directions so both need updating

The timeout is treated as one single value, but the datasheet describes
it as two 4 bit values, one for each direction of event.
As such change the driver to support the separate directions.
Also add limit checking to ensure it fits within the 4 bits.

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

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