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>
5 files changed