mdss: Remove lock from vsync control
mdss: Remove lock from vsync control

The lock protecting the vsync control ioctl is not needed since
the vsync control should take effect immediately and be
asynchronous to the display updates.

Change-Id: I5068246488b7fefec9e11e8422bacbe7489c827f
Signed-off-by: Naseer Ahmed <8dcb73d3151da6cb1ccc5cb471442932e4b77796@codeaurora.org>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas