drm/msm/dpu: Use V2 DITHER PINGPONG sub-block in SM8[34]50/SC8280XP

According to downstream sources this DITHER sub-block sits at an offset
of 0xe0 with version 0x20000. Lets fix this by using sc7280_pp_sblk
instead of sdm845_pp_sblk.

Fixes: 4a352c2f ("drm/msm/dpu: Introduce SC8280XP")
Fixes: 0e91bcbb ("drm/msm/dpu: Add SM8350 to hw catalog")
Fixes: 100d7ef6 ("drm/msm/dpu: add support for SM8450")
Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/534208/
Link: https://lore.kernel.org/r/20230411-dpu-intf-te-v4-6-27ce1a5ab5c6@somainline.org


[quic_abhinavk@quicinc.com: minor fix in the commit message]
Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>