msm: mdss: fix hang when down scaling video to more than half its size

When down scaling video more than twice, PCMN filter scaling should be
enabled for all components to avoid MDP errors which lead to hang or
underrun on screen.

Change-Id: I237bc3a16e4916c9270382f55ecae21b46743a5b
Signed-off-by: Adrian Salido-Moreno <adrianm@codeaurora.org>