treewide: move build helper to more fitting places

Change-Id: I3d0cfe9283222d403ae369ec9db09201ad511e15
Reviewed-on: https://review.monogon.dev/c/monogon/+/3327
Reviewed-by: Serge Bazanski <serge@monogon.tech>
Tested-by: Jenkins CI
diff --git a/metropolis/test/nanoswitch/BUILD.bazel b/metropolis/test/nanoswitch/BUILD.bazel
index 4954480..323d53e 100644
--- a/metropolis/test/nanoswitch/BUILD.bazel
+++ b/metropolis/test/nanoswitch/BUILD.bazel
@@ -1,5 +1,5 @@
 load("@io_bazel_rules_go//go:def.bzl", "go_binary", "go_library")
-load("//metropolis/node/build:def.bzl", "node_initramfs")
+load("//osbase/build:def.bzl", "node_initramfs")
 
 go_library(
     name = "nanoswitch_lib",
@@ -42,7 +42,7 @@
         "@cacerts//file": "/etc/ssl/cert.pem",
     },
     fsspecs = [
-        "//metropolis/node/build:earlydev.fsspec",
+        "//osbase/build:earlydev.fsspec",
     ],
     visibility = ["//metropolis/test:__subpackages__"],
 )