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drm/i915: Fix PIPEDMC disabling for a bigjoiner configuration Causing playback failure

drm/i915: Fix PIPEDMC disabling for a bigjoiner configuration Causing playback failure

Ref: https://lore.kernel.org/lkml/20230530134907.GA8@5e905162a5a7/

Ref: [v4,01/14] drm/i915: Fix PIPEDMC disabling for a bigjoiner configuration [git pull] drm fixes for 6.4-rc4 drm-fixes-2023-05-26: drm fixes for 6.4-rc4

This patch has caused a regression between 6.4-rc3 and 6.4-rc4. Other tested kernels include 6.3.4 work fine. Dropping the patch allows the decode playback of media via Kodi. Without dropping the patch - the media starts and stutters then ceases to play.

There is an additional issue that 6.4-rc4 audio playback is also failing (where 6.4-rc3 was fine), I have not yet tracked this down.

This is all on: DMI: Intel(R) Client Systems NUC12WSKi7/NUC12WSBi7, BIOS WSADL357.0087.2023.0306.1931 03/06/2023 12th Gen Intel(R) Core(TM) i7-1260P (family: 0x6, model: 0x9a, stepping: 0x3) microcode: updated early: 0x429 -> 0x42a, date = 2023-02-14

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