media: wave5: Add wave5 driver to maintainers file

Add the Chips&Media wave5 encoder/decoder driver
to the maintainers file

Signed-off-by: Robert Beckett <bob.beckett@collabora.com>
Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
Signed-off-by: Darren Etheridge <detheridge@ti.com>
Link: https://lore.kernel.org/linux-staging/20220111161604.22579-7-dafna.hirschfeld@collabora.com/