kernel/libs: VCHIQ: Make service closure fully synchronous
With these patches, calls to vchiq_close_service and vchiq_remove_service won't return until any associated callbacks
have been delivered to the callback thread.

firmware: video_render: Add parameter for setting the colourspace
Only applicable for non-opaque buffers

firmware: gpioman: Allow oscillator to be selected as a clock source

firmware: image_decode: huffman and quantization tables shouldn't trigger 'keep all following'
See: http://forum.stmlabs.com/showthread.php?tid=14839

userland: hello_jpeg: Fix decode fail when width/height can't be parsed from first 80K block

firmware: video_render: Fix for stereo rendering when crop height is not populated