Staging: iio: light: Added correct vendor-prefix for device isl29028

This patch adds the correct vendor-prefix for device isl29028 and
maintains deprecated vendor-prefix found by checkpatch warning
for older kernel releases.

Signed-off-by: Darshana Padmadas <darshanapadmadas@gmail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>