MAINTAINERS: A driver for TI/ROHM ADCs

Add undersigned as a maintainer for the ti-adc128s052.c which supports a
few TI's ADCs and the ROHM Semiconductor BD79704 ADC.

Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Link: https://patch.msgid.link/b303bf42b84e7ab143ff6a4a810f7d788e210b86.1744022065.git.mazziesaccount@gmail.com


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