drm/bridge: lt9611uxc: Register and attach our DSI device at probe

drm/bridge: lt9611uxc: Register and attach our DSI device at probe

[ Upstream commit 4a46ace5ac621c0f84b3910bc3c93acf6c93963b ]

In order to avoid any probe ordering issue, the best practice is to move
the secondary MIPI-DSI device registration and attachment to the
MIPI-DSI host at probe time. Let's do this.

Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20211025151536.1048186-11-maxime@cerno.tech
Stable-dep-of: 15fe53be46ea ("drm/bridge: lt9611uxc: fix the race in the error path")
Signed-off-by: Sasha Levin <sashal@kernel.org>