[ALPS08729084] DISP: enable vdo preurgent for mt6989

[Description]
1.enable vdo mode preurgent to get enough data when prefetch data

[Test]
1.bootup success
2.met check not always trigger urgent
3.camera preview scenario will not occur underrun

MTK-Commit-Id: 8fb34eb2d569981c4bd69179fedc3dfc0373e07c

Signed-off-by: Hongjiang He <Hongjiang.He@mediatek.com>
CR-Id: ALPS08729084
Feature: display_mobile
Change-Id: I2a8b102b96e69c2967fe4d3e8bdbe9333c2f1cd4