MAINTAINERS: correct file entry IIO LIGHT SENSOR GAIN-TIME_SCALE HELPERS

Commit ca11e4a3 ("MAINTAINERS: Add IIO gain-time-scale helpers"),
updates the MAINTAINERS file. However the files listed do not exist.
These presumably come from commit 38416c28 ("iio: light: Add
gain-time-scale helpers")

Fix the entries.

Found by ./scripts/get_maintainer.pl --self-test=patterns

Fixes: ca11e4a3 ("MAINTAINERS: Add IIO gain-time-scale helpers")
Signed-off-by: Amit Dhingra <mechanicalamit@gmail.com>
Acked-by: Matti Vaittinen <mazziesaccount@gmail.com>
Link: https://lore.kernel.org/r/CAO=gReFVhp7QK_XZRBO5vbv6fmFb4BdsZeQPSzWvuiz9UeQekA@mail.gmail.com


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