[Buildroot] Host aarch64 external toolchain support?

[Charles Hardin]

Just checking to see if this support is already being considered in next or
a new revision, it seems that all of the external toolchains are based on
HOSTARCH x86_64 at this moment.

We have some server arms for the buildfarm and likely will have some people
building on Apple M1 chips as well - which means we are going to need
prebuilt toolchains for multiple hostarchs.

So, it would seem that the flow should be to make sdk on the both x86_64
and aarch64 HOSTARCHs and then push the tarballs up. However, the
BR2_TOOLCHAIN_EXTERNAL_CUSTOM options seem to provide only a single
download path without a selection on BR2_HOSTARCH or a conditional.

Is this the incorrect approach to use? or what has worked for people
dealing with this already?

Thanks in advance,
Charles
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