Overridden do_compile() task relies on an old DEFAULTTUNE set to
identify if the build should target arm32 or arm64 architecture, and has
a direct comparison to the generic tune. Since aarch64 tune for some
derivatives has been switched to a more specialized types (cortexa53-crypto),
this causes the check to fail and build defaults to arm32, which is not
desired behavior.
Define OPTEE_ARCH to a proper value based on machine overrides, drop the
task override and use standard Yocto mechanisms to provide additional
parameters to make.
