[][kernel][MT7988][i2c][update i2c clock and remove it from always-on list]

[Description]
Remove i2c clocks from always-on list in mt7988-clkitg.dtsi,
and update i2c dummy clocks to real clcok in mt7988.dtsi

[Release-log]
N/A

Change-Id: I57791df2e9f9f4729cb2d32f734090de52c140f3
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6966550
2 files changed