mdss: mdp: remove the mdss clock vote in case of error

While applying dynamic refresh rate, there is a possibility of
failure to apply new refresh rate and has to release all resources
acquired. Remove the clock vote in the case of failure to
apply new refresh rate.

Change-Id: I882b51a94499b1984b10b176ed9dac3daf595d81
Signed-off-by: Jeevan Shriram <jshriram@codeaurora.org>