[U-Boot] merge arm64 to arm

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FengHua <fenghua at phytium.com.cn> writes:

> hi tom,
> hi albert,
> yes, it's right. the u-boot could be more uniformly and maintainable
> if merging armv8 to arm architecture. I will try to migrate arm64 to
> armv8 subarchitecture of arm. do you have any other advice?

Why?  The architectures are vastly different, arm64 (aarch64) being only
loosely inspired by the 32-bit arm.  It is not like with x86/amd64 where
a lot of code can be shared.

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mans at mansr.com