drm/msm/dpu: remove DSC feature bit for PINGPONG on MSM8937

drm/msm/dpu: remove DSC feature bit for PINGPONG on MSM8937

The MSM8937 platform doesn't have DSC blocks nor does have it DSC
registers in the PINGPONG block. Drop the DPU_PINGPONG_DSC feature bit
from the PINGPONG's feature mask and, as it is the only remaining bit,
drop the .features assignment completely.

Fixes: c079680bb0fa ("drm/msm/dpu: Add support for MSM8937")
Reported-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/640299/
Link: https://lore.kernel.org/r/20250301-dpu-fix-catalog-v2-1-498271be8b50@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>