[][Kernel][mt7988][uart][change to configure uart clock in dtsi file]

[Description]
Change to configure uart clock in dtsi file.

[Release-log]
N/A


Change-Id: I449c7964cfe18a6d9c502773559981a75df8cbb5
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6854280
2 files changed