runtime: call runtime_nanotime1, not runtime_nanotime

The function name was changed in 1.14beta1. Fix the non-x86, non-s390 code.

Fixes golang/go#36694

Change-Id: Ib53b5732fbb23c82dcfc8ab9738a0fc7551a2d5b
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/215724
Reviewed-by: Cherry Zhang <cherryyz@google.com>