drm/vc4: Fix oops dereferencing DPI's connector since panel_bridge.

drm/vc4: Fix oops dereferencing DPI's connector since panel_bridge.

In the cleanup, I didn't notice that we needed to dereference the
connector for the bus_format.  Fix the regression by looking up the
first (and only) connector attached to us, and assume that its
bus_format is what we want.  Some day it would be good to have that
part of display_info attached to the bridge, instead.

v2: Fix stray whitespace change

Signed-off-by: Eric Anholt <[email protected]>
Fixes: 7b1298e05310 ("drm/vc4: Switch DPI to using the panel-bridge helper.")
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Sean Paul <[email protected]>
Reviewed-by: Boris Brezillon <[email protected]>
Signed-off-by: Sean Paul <[email protected]>