kernel: bcm2708: Make the new MMC be enabled by default

See: http://www.raspberrypi.org/forums/viewtopic.php?f=63&t=85061
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
Add missing files from last update
kernel: bcm2708_i2s avoid address space leak
See: https://github.com/raspberrypi/linux/issues/687

firmware: hdmi: Add gencmd for controlling small adjustments to hdmi pixel clock
firmware: MMAL: Pass dec_params in opaque buffers

Pass the contents of the decoder params in opaque buffers, particularly to relay interlace properties

firmware: gpioman: Reduce huge amount of log spam

firmware: hdmi: add gencmd to limit rate of change of hdmi clock adjustment

firmware: services: Avoid bad behaviour from calling init functions more than once
See: https://github.com/raspberrypi/userland/issues/205

firmware: Remove dts_whole_frames config option
firmware: dtsbits: Handle parsing (and discarding) extension packets
See: http://forum.osmc.tv/showthread.php?tid=15538&pid=109277
kernel: Bump to 3.12.29

kernel: VCHIQ: Add per-service tracing
The new service option VCHIQ_SERVICE_OPTION_TRACE is a boolean that toggles tracing for the specified service.

kernel: vchiq: Make the synchronous-CLOSE logic more tolerant

firmware: deinterlace: Fix for garbage in bottom row of non-32-aligned height
firmware: deinterlace: support half framerate variants
firmware: mmal: allow user flags to be passed through to omx and returned