Revert "msm: mdss: refactor command mode vsync control logic"

This reverts commit 6b3562410531399820ca19ebdf106afbffb44781.
Revert "msm: mdss: set vsync clock rate"

This reverts commit 48af464707e298194f4ef18ca5102ade359bb2f6.
Revert "msm: mdss: enable vsync event during continuous splash"

This reverts commit 6759285e5048b2f9e2cc43de1bc80ee764c742c7.