boot-wrapper-aarch64: bump version and switch to autotools-package

This commit updates boot-wrapper-aarch64 to the latest version. As it
now uses the autotools, we switch the package to the autotools-package
infrastructure.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>