[Backport request for 5.4.y] clk: hi6220: use CLK_OF_DECLARE_DRIVER

Hi, Greg

Could you please help to cherry-pick the following commit to the 5.4.y branch?

f1edb498bd9f ("clk: hi6220: use CLK_OF_DECLARE_DRIVER")

It's been there since the 5.10 kernel, and this along with the reset controller patch are needed for Hikey devices to work with 5.4.y kernels, otherwise it will get stuck during the boot.