MAINTAINERS: Add ROHM BU27034

Add myself as a maintainer for ROHM BU27034 ALS driver.

Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Link: https://lore.kernel.org/r/eac4b5f7fc8adcaac59ffa73e46cd7bb9c90edfa.1680263956.git.mazziesaccount@gmail.com


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