[PATCH 4.15 026/146] drm/amd/powerplay/smu7: allow mclk switching with no displays

4.15-stable review patch. If anyone has any objections, please let me know. -- From: Alex Deucher commit 51954e17914aaadf18d97b21c2a2cee16fa29513 upstream. If there are no displays attached, there is no reason to disable mclk switching. Fixes mclks

[PATCH 4.15 026/146] drm/amd/powerplay/smu7: allow mclk switching with no displays

4.15-stable review patch. If anyone has any objections, please let me know. -- From: Alex Deucher commit 51954e17914aaadf18d97b21c2a2cee16fa29513 upstream. If there are no displays attached, there is no reason to disable mclk switching. Fixes mclks getting set to high when