clk: mediatek: add clocks dt-bindings required header for MT7622 SoC

Add the required header for the entire clocks dt-bindings exported
from topckgen, apmixedsys, infracfg, pericfg, ethsys, pciesys, ssusbsys
and audsys which could be found on MT7622 SoC.

Signed-off-by: Chen Zhong <chen.zhong@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>