Display module keeps fix sleep vote on mnoc, ebi
and llcc. This does not need the split vote because
it is same for all three clients. Single node
creation also reduces the bus vote latency.

Change-Id: I850ab1fdcaa05db389c1a4a163af34db6865f545
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>