hooks: add ti-u-boot to the / exception

BUG=b:150818446
TEST=CQ passes

Change-Id: I1f3f0ee86d27c0cf878fd4ed1fed8cf360108360
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/2088354
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
diff --git a/hooks/filesystem-sanity.py b/hooks/filesystem-sanity.py
index 0e0da32..26de940 100755
--- a/hooks/filesystem-sanity.py
+++ b/hooks/filesystem-sanity.py
@@ -76,6 +76,8 @@
     'dev-go/go-tools',
     # TODO(b/150694105): Delete this.
     'net-wireless/wpantund',
+    # TODO(b/150818446): Delete this.
+    'sys-boot/ti-u-boot',
 }
 
 # These SDK packages need cleanup.