Add global patch directory pointing to board specific .hash files
for uboot, linux, linux-headers and add BR2_DOWNLOAD_FORCE_CHECK_HASHES.
This way we can drop this defconfig entry in .checkpackageignore.
Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
