setup_sdcard.sh: bone_dtb unused

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
setup_sdcard.sh: panda this custom buddy no longer exists

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
setup_sdcard.sh: drop expansion_args

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
setup_sdcard.sh: console=tty0 always on except for serial

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
setup_sdcard.sh: cleanup a lot of crap when you assume KMS mode

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
setup_sdcard.sh: its 2014 bootloader sets these

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>