drm/msm: correct creation order of display thread & crtc

Display threads are created based on number of crtc in
the system. However, since crtc is created after display
thread is created, there is no display thread created.

Reorder crtc creation to before display thread creation
so proper number display threads are created.

CRs-Fixed: 2005348
Change-Id: I338b46c7d6081f93a3aafa12be88f2c7caa9b4e5
Signed-off-by: Alan Kwong <akwong@codeaurora.org>