[ALPS05387552] DISP: fixed set_session_mode too long for 90fps

[Detail] set_session_mode request too long times, because
change the DVFS API

[Solution] remove the pm qos DVFS API

MTK-Commit-Id: 5d2d413e2df7c8a2124e20dc31b7c3e5b97507af

Change-Id: I0606a9572e2ab031327b7ed1898aff5581d09441
Signed-off-by: cui.li <cui.li@mediatek.com>
CR-Id: ALPS05387552
Feature: [Module]Display Driver