[][upload 7981 clk drivers]

[Description]
Add clk drivers

[Release-log]
N/A

Change-Id: I9adb84d4e2be94f11dfa55a83d73926c1adca75e
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/5064129
4 files changed