kernel: Some improvements for I2S audio
See: https://github.com/raspberrypi/linux/issues/681

kernel: bcm2708_fb: Reduce dmesg spam
See: https://github.com/raspberrypi/linux/issues/685

kernel: Added driver for HiFiBerry Amp amplifier add-on board
See: https://github.com/raspberrypi/linux/pull/659

MMAL: Rebuilt with updated MMAL makefiles