[fuchsia] Only provide //sdk/bundles:tools in cache packages.

This fixes local-sdk.py SDK builds to match Fuchsia's 'terminal'
SDK images.

Bug: fuchsia:50751
Change-Id: I49bbd26eb94f438029f62f971ee823eb40e1435b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2215329
Auto-Submit: Wez <wez@chromium.org>
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772030}

tools/fuchsia/local-sdk.py

@@ -37,8 +37,8 @@ def EnsureEmptyDir(path):
 def BuildForArch(arch):
   build_dir = 'out/release-' + arch
   Run('scripts/fx', '--dir', build_dir, 'set', 'core.qemu-' + arch,
-      '--with-base=//sdk/bundles:tools', '--args=is_debug=false',
-      '--args=build_sdk_archives=true')
+      '--args=cache_package_labels=["//sdk/bundles:tools"]',
+      '--args=is_debug=false', '--args=build_sdk_archives=true')
   Run('scripts/fx', 'build', 'sdk', 'build/images')