Add start/fixup files to config.txt and boot directory to enable CSI cam...

...era support

Tested using VideoCore revision 61f86f04533663811eecbd5e705046165cb5bad5 and bootloader revision 4f2a7b9b2a3d6c11f3e39e0006ad1e4731f5b275.

The bootloader files are copied to the /boot directory, user need to uncomment lines in config.txt to load these.