Merge "scripts: restore usepkgonly flag to cross-dev build." into main

scripts/cros_setup_toolchains.py

diff --git a/scripts/cros_setup_toolchains.py b/scripts/cros_setup_toolchains.py
index cd52ef5..f704556 100644
--- a/scripts/cros_setup_toolchains.py
+++ b/scripts/cros_setup_toolchains.py
@@ -307,7 +307,7 @@
         cmdbase.extend(["-P", "--oneshot"])
         if usepkg:
             cmdbase.extend(
-                ["-P", "--getbinpkg", "--without-headers"]
+                ["-P", "--getbinpkg", "-P", "--usepkgonly", "--without-headers"]
             )
 
         overlays = " ".join(