hooks: add chromeos-base/chromeos-bsp-initramfs-rialtoto the /var exception

BUG=chromium:1059308
TEST=CQ passes

Change-Id: I8fdf13d62621a3aabbd66ee8813ce1cd156c57f8
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/2091836
Reviewed-by: Chris McDonald <cjmcdonald@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
diff --git a/hooks/filesystem-sanity.py b/hooks/filesystem-sanity.py
index 0e0da32..78a7472 100755
--- a/hooks/filesystem-sanity.py
+++ b/hooks/filesystem-sanity.py
@@ -98,6 +98,8 @@
     'app-crypt/trousers',
     'app-emulation/containerd',
     'app-emulation/lxc',
+    # https://crbug.com/1059308
+    'chromeos-base/chromeos-bsp-initramfs-rialto',
     'chromeos-base/chromeos-initramfs',
     # https://crbug.com/1054646
     'chromeos-base/devserver',