hooks: disallow SDK packages installing into /boot

This directory only makes sense for boards, not the SDK.

BUG=None
TEST=SDK builders passes

Change-Id: I50502ebaf24080679b89ba29e1e088b79eaebb83
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/2113298
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Alex Klein <saklein@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
1 file changed