[media] media: i2c: Convert to devm_regulator_bulk_get()

Using the managed function the regulator_bulk_put() calls can be removed
from the probe error path and the remove handler.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>