stv0991: record defconfig ownership in MAINTAINERS
This commit fixes warnings reported by tools/genboardscfg.py.
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Vikas Manocha <vikas.manocha@st.com>
Acked-by: Vikas Manocha <vikas.manocha@st.com>