firmware: usb: add usb_mdio config option and set the default to 0x5000
Use: usb_mdio=0x7000 to revert the behaviour

kernel: dwc_otg: Don't issue traffic to LS devices in FS mode
See: https://github.com/raspberrypi/linux/pull/390

kernel: Add INITRD, BLK_DEV_DM and DM_CRYPT kernel options
See: https://github.com/raspberrypi/linux/issues/392
See: https://github.com/Hexxeh/rpi-firmware/issues/29

kernel: bump to 3.10.15