iio: adc: aspeed: set driver data when adc probe.

iio: adc: aspeed: set driver data when adc probe.

commit 7eb8e1f60b955de74f7b7a561d943edc98823589 upstream.

Fix the issue when adc remove will get the null driver data.

Fixed: commit 52b07e7a1f57 ("iio: Aspeed ADC")
Signed-off-by: Billy Tsai <billy_tsai@aspeedtech.com>
Link: https://lore.kernel.org/r/20210831071458.2334-2-billy_tsai@aspeedtech.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>