Lacros: Add Lacros builder to CHROMEOS_LKGM presubmit

This CL adds lacros builder to the CHROMEOS_LKGM presubmit cq list to
prevent regressions.

BUG=None
TEST=unit tests

Change-Id: I0966e0b28d0b88ffef5beed3dbe4920df9a3a10d
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/2669421
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Tested-by: Yuke Liao <liaoyuke@chromium.org>
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
diff --git a/scripts/chrome_chromeos_lkgm.py b/scripts/chrome_chromeos_lkgm.py
index de46f7f..eab1fa7 100644
--- a/scripts/chrome_chromeos_lkgm.py
+++ b/scripts/chrome_chromeos_lkgm.py
@@ -41,6 +41,7 @@
       'chromeos-betty-pi-arc-chrome',
       'chromeos-eve-chrome',
       'chromeos-kevin-chrome',
+      'lacros-amd64-generic-chrome',
   ]
   # Files needed in a local checkout to successfully update the LKGM. The OWNERS
   # file allows the --tbr-owners mechanism to select an appropriate OWNER to