[ALPS08716345] DISP: fix lp_perline

[Description]
if lp_perline_en=0,DSI_CON_CTRL[24]=0
[Test]
display MEstress test

MTK-Commit-Id: b4c8fd1adc2c1b628328d04c4316d450290222cd

Signed-off-by: Guangyang Duan <guangyang.duan@mediatek.com>
CR-Id: ALPS08716345
Feature: display_mobile
Change-Id: I68d163f19fc39a4f1c02d76fccd56ef9e0d72290