configs/mx6sx_udoo_neo: add hashes Add hashes for uboot and linux, and enable BR2_DOWNLOAD_FORCE_CHECK_HASHES. Modify .checkpackageignore to enable the hash check for the Udoo Neo config. Signed-off-by: Philip-Dylan Gleonec <philip-dylan@gleonec.bzh> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>