DRM MSM 6.12 fixes

Hi Rob

Here is the summary of display fixes for 6.12:

Display:

• move CRTC resource assignment to atomic_check otherwise to make consecutive calls to atomic_check() consistent
• fix rounding / sign-extension issues with pclk calculation in case of DSC
• cleanups to drop incorrect null checks in dpu snapshots
• fix to use kvzalloc in dpu snapshot to avoid allocation issues in heavily loaded system cases
• Fix to not program merge_3d block if dual LM is not being used
• Fix to not flush merge_3d block if its not enabled otherwise this leads to false timeouts

gfx :

• add a fence wait before SMMU table update

Thanks

Abhinav