[redhat] configs: Disable experimental GSM MUX line discipline

Jeremy Lintonrequested to merge
jlinton/kernel-ark:os-build-disable_n_gsm into os-build

Most other distro's have disabled this following a series of exploits earlier this year, and the general take that the driver wasn't sufficiently maintained. Lets follow gregkh's suggestion and disable it.

Signed-off-by: Jeremy Linton jlinton@redhat.com

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