package/owl-linux: use kernel-module helper

The owl-linux' Makefile is only calling the Linux buildsystem, so switch
do using the new kernel-module infra.

Get rid of first patch, no longer needed; rename remaining patch.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>