configs/beaglebone_qt5_defconfig: add hashes for Linux/headers/U-Boot
The patch adds .hash files for Linux, Linux headers and U-Boot and then
enables BR2_DOWNLOAD_FORCE_CHECK_HASHES. With this, we can now drop the
defconfig from .checkpackageignore.
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>