[ALPS08873280] disp: Dont enter the PU main flow when fps switch

[Description]
Dont enter the PU main flow when fps switch and PU is disable

[Test]
Build Pass

MTK-Commit-Id: b735bd59b5c6e44de78cb9d4b9b84e0be0362763

Signed-off-by: jj chen <jj.chen@mediatek.com>
CR-Id: ALPS08873280
Feature: display_mobile
Change-Id: Icbaeabadedee36e78636606f3be1e20e02c2d4ff