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drm/xe: Fix wopcm size

Balasubramani Vivekanandan requested to merge fix-wopcm-size into drm-xe-next

The wopcm size returned by xe_wopcm_size function is used in calculating the GuC wopcm base offset and the GuC wopcm size. It is also used to find the size of the wopcm space to be reserved at the bottom of the GGTT address space. So it is the per-GT wopcm size and not the total wopcm area used by all GTs. Fix the wopcm size to 2MB which is the wopcm size per-GT for platforms above Gen11.

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