support/kconfig: bump to kconfig from linux-3.12

With this, we can trash our probability patch, it's now upstream.
Refresh a few other patches.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>