[][arm64: dts: mt7986: Add mmc subsys clock control]

[Description]
Add support for the additional subsys clocks to allow it to be
configured appropriately.

[Release-log]
N/A

Change-Id: I7a2c965f88e705c29483f4c722134780d91a53bd
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/5950105
4 files changed