drm/panel: visionox-r66451: Set prepare_prev_first flag

The DSI host needs to be enabled for the panel to be initialized in
prepare(). Ensure this happens by setting prepare_prev_first.

Signed-off-by: Jessica Zhang <quic_jesszhan@quicinc.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20240202-visionox-r66451-prev-first-v1-1-c267dc889284@quicinc.com


Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240202-visionox-r66451-prev-first-v1-1-c267dc889284@quicinc.com