When POWERDEVIL_NO_DDCUTIL is set, the platform initialization should be skipped entirely. This restores the old behavior before a6b9cf5f.
CCBUG: 488373
(cherry picked from commit 40625d03)
Co-authored-by: Yifan Zhu <fanzhuyifan@gmail.
I plan to merge after the 6.1 release; targetting 6.1.1.