[Backport request for 5.4.y] reset: hi6220: Add support for AO reset controller

Hi, Greg

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

697fa27dc5fb ("reset: hi6220: Add support for AO reset controller")

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