drm/msm/dpu: enable DSPP_2/3 for LM_2/3 on sm8450

Mark DSPP_2 and DSPP_3 as used for LM_2 and LM_3

Fixes: 100d7ef6 ("drm/msm/dpu: add support for SM8450")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/531491/
Link: https://lore.kernel.org/r/20230408002750.2722304-3-dmitry.baryshkov@linaro.org


Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>