linux-custom: initial config
linux-custom: config tweaks, update to v3.15-rc1-356-gebfc45e

 - Enable serpent and twofish (for cryptsetup benchmark).
 - Considered to disable MTD, but it allows to access VRAM.
   https://wiki.archlinux.org/index.php/Swap_on_video_ram
 - Enable bonding.
 - Disable DCB (Data Center Bridging Support).
 - Disable Userspace I/O drivers (not needed?).
 - Disable USB gadget (not applicable for my laptop).
 - Disable OHCI (I only have EHCI and XHCI in lspci).
 - Disable MEI (Intel Management Engine Interface), not used.
 - Enable BT_HIDP (for Bluetooth HID profiles).
 - netfilter/ipv4: allow raw table.
 - Disable Virtual MIDI Soundcard (snd-usbmidi-lib).
 - Disable SND_PCSP (I have a soundcard, help suggests N).
 - Disable SND_DUMMY (no need for it).
 - Disable x32 ABI (X86_32), not used.
linux-custom: disable locking selftests

Oops, this was not intended.