[ALPS08848700] drm: dsi: fix dsi1 display abnormal after esd recovery

[Description]
Update slave_dsi.vm.<porch> after switching framerate.
Avoid porch differences between dsi0/1 after esd recovery.

[Test]
DSI1 display ok after ESD recovery

MTK-Commit-Id: 8498fa7bf02f2f3861d0dd7910f074aa40ef45a7

Signed-off-by: Huijuan Xie <huijuan.xie@mediatek.com>
CR-Id: ALPS08848700
Feature: Always On Display
Change-Id: I48c31616c70df9cc7fdff3387ebdd05dee08bc70