[ALPS08603544] Remove stream on CPU hint

StreamOn CPU hint probably conflict with the NxSpeed CPU hint
Note: Thumbnail issue has already been solved by boosting vdec
freq first frame, no need streamOn CPU hint

MTK-Commit-Id: ad9f3fe7769b0beb0336bf6f08c2ae88b19f2e20

Signed-off-by: Mike Tsai <min-han.tsai@mediatek.com>
CR-Id: ALPS08603544
Feature: Video Driver
Change-Id: I68bbcffeb48d75308605dfe7e96b4d2725eb86f6