MAINTAINERS: Add an entry for AF8133J driver

As I am submitting the driver and have the device to test. I'll maintain
the driver.

Signed-off-by: Ondrej Jirman <megi@xff.cz>
Link: https://lore.kernel.org/r/20240222011341.3232645-5-megi@xff.cz


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