staging: iio: light: convert multiple spaces to tab

Using tab inplace of multiple spaces for indenting.
Signed-off-by: NLaxman Dewangan <ldewangan@nvidia.com>
Acked-by: NJonathan Cameron <jic23@kernel.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>