MAINTAINERS: add entries for several media drivers

add entries for the following drivers:
- earth_pt{1,3} DVB adapter drivers
- mxl301rf DVB tuner drivers
- qm1d1{b0004, c0042} DVB tuner drivers
- tc90522 DVB demod driver

Signed-off-by: Akihiro Tsukada <tskd08@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>