package/ocf-linux: use kernel-module helper

We have a patch that makes ocf-linux' Makefile basically only call to
the Linux buildsystem, with commands basically like:
    make -C $(LINUX_DIR) M=$(pwd) modules

which is basically what our new kernel-module infra basically does.

Remove our patch since it is basically no longer needed.

Basically-Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

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