siso: add missing config import

fix-forward for https://ci.chromium.org/ui/p/chromium/builders/ci/build-perf-windows-siso/530/overview bug in migration https://crrev.com/c/4572070

Bug: b/273407069
Change-Id: If571ddb4898f84ee6a0a5462ff90dd026af20e51
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4570358
Commit-Queue: Fumitoshi Ukai <[email protected]>
Commit-Queue: Richard Wang <[email protected]>
Auto-Submit: Richard Wang <[email protected]>
Reviewed-by: Fumitoshi Ukai <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1150432}
NOKEYCHECK=True
GitOrigin-RevId: 2d7264145764eafe40bfea882c08a14164ce6a9c

Author: rzhw

config/siso/mac.star

@@ -5,6 +5,7 @@
 """Siso configuration for macOS."""
 
 load("@builtin//struct.star", "module")
+load("./config.star", "config")
 load("./remote_exec_wrapper.star", "remote_exec_wrapper")
 
 __filegroups = {}

config/siso/windows.star

@@ -5,6 +5,7 @@
 """Siso configuration for Windows."""
 
 load("@builtin//struct.star", "module")
+load("./config.star", "config")
 load("./remote_exec_wrapper.star", "remote_exec_wrapper")
 
 __filegroups = {}