Revert "msm: mdss: set vsync clock rate"

This reverts commit 48af464707e298194f4ef18ca5102ade359bb2f6.
Revert "msm: mdss: Fix race condition for vsync irq enable/disable"

This reverts commit a49e166c8981efa92aabb8eb4b8a0b923c5fd664.
Revert "msm: mdss: enable vsync event during continuous splash"

This reverts commit 6759285e5048b2f9e2cc43de1bc80ee764c742c7.