drm/amd/display: Fix ISM dc_lock deadlock during suspend

Status from this message: Queued for 7.1, thanks.

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#	Subject and files	Size	Replies	Applied
1/1	drm/amd/display: Fix ISM dc_lock deadlock during suspend`drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c` `drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_ism.c` `drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_ism.h`	+70 ~~-12~~	1 reply

The patch has a Reviewed-by or Acked-by.

Patch	Sun peng (Leo) Li	Dan Wheeler
1/1	R-b	T-b

Trailers given in replies are filled; those carried in the patches from earlier versions are outlined with dashes.