Use devm_gpiochip_add_data() for GPIO registration and remove the
call for gpiochip_remove() from error path.

Also remove the need of driver callback .remove.
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Cc: Michael Hennerich <michael.hennerich@analog.com>
Acked-by: Michael Hennerich <michael.hennerich@analog.com>