drm/msm/dpu: pull connector from dpu_encoder_phys to dpu_encoder_virt

drm/msm/dpu: pull connector from dpu_encoder_phys to dpu_encoder_virt

All physical encoders used by virtual encoder share the same connector,
so pull the connector field from dpu_encoder_phys into dpu_encoder_virt
structure. Otherwise code suggests that different phys_encs
can have different connectors.

Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20220217035358.465904-8-dmitry.baryshkov@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>