drm fixes for 6.8-rc1

i915:
- Fixes for kernel-doc warnings enforced in linux-next
- Another build warning fix for string formatting of intel_wakeref_t
- Display fixes for DP DSC BPC and C20 PLL state verification

v3d:
- register readout fix

rockchip:
- two build warning fixes

nouveau:
- fix GSP loading on Turing with different nvdec configuration
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