sw: cleanup sobel.c file
sd: clean up libraries

renamed folder from libdrm to lib and modified init.sh accordingly
deleted radeon and nouveau drm libs
added v4l2, v4l2subdev, v4lconvert, mediactl and jpeg libs
sd: add device tree source and update binary blob

Add axi_vdma_2 node to device tree with both channels enabled:
mm2s is connected to sobel input and s2mm is connected to sobel output.
Set root to /dev/ram (was /dev/nfs).
sd: update kernel image and add config file

I got an error when compiling the kernel with the sobel filter driver
enabled, hence the current config and image have the driver disabled.