drm/sti: drop use of drmP.h

Stop using the deprecated drmP.h header file.
Replaced with relevant forwards or headers files.
Header files sorted in all files touched.

Build tested with allyesconfig, allmodconfig for a number of
architectures.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Cc: Vincent Abriou <vincent.abriou@st.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190605134835.25112-2-sam@ravnborg.org

gpu: drm: sti: Adopt SPDX identifiers

Add SPDX identifiers to files under sti directory

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com>
Acked-by: Vincent Abriou <vincent.abriou@st.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171206112947.9569-2-benjamin.gaignard@st.com

drm: sti: add DVO output connector

Digital Video Out connector driver LCD panels.
Like HDMI and HDA it create bridge, encoder and connector
drm object.
Add binding description.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>