Try to fix genimage error by deleting partition-type in config to make raspberry pi 4 image compile

Remove partition-type in raspberrypi-4/image.bst. Update config.txt content to be refreshed with better performance. Change firmware source from git_tag to tar (useless to download the entire repo as we just want some binaries which are not updated) Update u-boot source to latest. Add new dtbo to allow pi 400 to boot. Switch from fkms to kms.