iio: adc: at91-sama5d2_adc: update copyright and authors information

Update copyright and authors information (corrected e-mail address), and
add myself as one of the authors.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Link: https://lore.kernel.org/r/20210901123013.329792-9-eugen.hristev@microchip.com


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