payloads: add support lz4 compression

Add the option to use the lz4 compression method
to compress payloads.
Also sets LZ4 as the default compression method.

Change-Id: Ic712f984f791d268440c8463eaea0d246aa31d99
Signed-off-by: Antonello Dettori <dev@dettori.io>
Reviewed-on: https://review.coreboot.org/15817
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
2 files changed