DRM MSM fixes for 6.8

Hi Rob

Here are the list of fixes for 6.8 so far. We are making somewhat slow progress on some of the bugs so minor fixes this time, namely:

• fix for kernel doc warnings and smatch warnings in dpu_encoder
• fix for smatch warning in dpu_encoder
• fixes to handle unknown bpc case correctly for DP. The current code was spilling over into other bits of DP configuration register, had to be fixed to avoid the extra shifts which were causing the spill over
• fix the bus bandwidth value for SDM670
• fix for MISC0 programming in DP driver to program the correct colorimetry value

Thanks

Abhinav