[Bug 97594] [amdgpu SI] "drm/amd/amdgpu: Add GRBM lock to various SI functions" breaks amdgpu support for SI

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Comment # 7 on bug 97594 from
The problem is a double lock.  The grbm_idx_mutex lock is taken in
gfx_v6_0_get_cu_info() which then calls gfx_v6_0_get_cu_active_bitmap() which
also takes the lock.

The fix is to remove the lock and the select from the parent function.  I'll
attach a patch momentarily.


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