drm/sti: remove deprecated legacy vtg slave

stih416 chip family is no more supported in Linux v4.9.
It is then useless to keep vtg slave field since it not used at all for
the stih407/10 chip family supported by sti driver.

Signed-off-by: Vincent Abriou <vincent.abriou@st.com>
This commit is contained in:
Vincent Abriou 2017-02-02 09:52:32 +01:00
commit 0c7ff84f7f