clk: hisilicon: add CRG driver for Hi3798MV200 SoC

[185264646]

Add CRG driver for Hi3798MV200 SoC. CRG(Clock and Reset Generator) module generates clock and reset signals used by other module blocks on SoC. It is similar to HI3798CV200. Note that there are many clocks not being documented and implemented yet, such as cipher, OTP, GPU etc..

[yangfl]

1 introduces fully declarative framework for hisi clocks and can easily cover this patch.

[yangfl]

Merged into #1

[185264646]

1 introduces fully declarative framework for hisi clocks and can easily cover this patch.

Do you think it really gains by implementing a hi3798 generic driver? I'm in favor of putting crg drivers in separate files actually, just like what rockchip or msm did.

[185264646]

Merged into #1

I'm not in a hurry, this is just a draft. For review purpose only. We still have much to do.

[yangfl]

Currently we only need focusing on hisi clock framework reimplantation which is required by subsystem maintainer somehow. Whether clocks for variants should be in different files can be discussed later.