Revert "msm: mdss: Move splash thread functionality"

This reverts commit fa15ca6454c90d902d1519836f377846991d83a7.

Conflicts:
	drivers/video/msm/mdss/mdss_fb.c
	drivers/video/msm/mdss/mdss_fb.h
	drivers/video/msm/mdss/mdss_mdp_overlay.c
	drivers/video/msm/mdss/mdss_mdp_splash_logo.c