[ALPS08645061] arm64: dts: mt6989: change OVL MMQOS larb21 configuration

[Detail]
Modify OVL larb21 port configuration SLAVE_COMMON setting from 1 to 0.

MTK-Commit-Id: 4622dd4a39bfa8a2f9e0d3aeca532efbe5af94a7

CR-Id: ALPS08645061
Feature: display_mobile
Signed-off-by: tai-hua.tseng <tai-hua.tseng@mediatek.com>
Change-Id: I1e5a0cd1bf98e83ccba0081c54ef4aed6cec3b5a