drm/msm: remove extra 1.6 GBps added to the ab vote

Current driver votes for extra 1.6GBps through the
apps rsc. Remove this extra vote that is not
required, as driver is already voting for the
required bandwidth through the display rsc.

Change-Id: I05c3c615ff94240c060f8f8466c500b489c92559
Signed-off-by: Ingrid Gallardo <ingridg@codeaurora.org>