Import patches from:
http://git.kernel.org/cgit/linux/kernel/git/dhowells/linux-fs.git/log/?h=keys-uefi
that enable a new option that automatically loads keys from db
and MOK into the secondary keyring, so that they can be used to
verify the signature of kernel modules. Enable the required KCONFIGs.
Allows users to self-sign modules (eg: dkms).