remove prebuilt kernel

Change-Id: Ibcdfcf45510b16b03718991bbf1af70094d52dd6
Signed-off-by: Roman Birg <roman@cyngn.com>
add gitignore

Change-Id: I5b267057baac2ae0c44f7ff15625efccd155f043
Signed-off-by: Roman Birg <roman@cyngn.com>