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
firmware: pull upstream
kernel: merge upstream and bump version to 3.16.4