[dev.regabi] runtime: don't mark rt0_go ABIInternal
[dev.regabi] runtime: don't mark rt0_go ABIInternal

rt0_go is not actually ABIInternal, and it actually has callers
(e.g. _rt0_amd64).

Change-Id: Id730176e620ad9f443e6bfca6ded81a1367531ba
Reviewed-on: https://go-review.googlesource.com/c/go/+/289193
Trust: Cherry Zhang <d62e63aa42ce272d7b6a5055d97e942b33a34679@google.com>
Reviewed-by: Than McIntosh <4b2922593166fc595a9b1a408f34f5d3817fe9d2@google.com>

golang/go,golang/go,nawawi/go,golang/go,CAFxX/go,cloudflare/go,CAFxX/go,golang/go,CAFxX/go,CAFxX/go,nawawi/go,CAFxX/go,cloudflare/go,cloudflare/go,nawawi/go,nawawi/go,CAFxX/go,nawawi/go,nawawi/go,CAFxX/go,nawawi/go,cloudflare/go,nawawi/go,golang/go,cloudflare/go,golang/go,CAFxX/go,cloudflare/go,cloudflare/go,golang/go,cloudflare/go,golang/go