Update all links

[DhruvaG2000]

Since all CCL users will be using this blog as reference to install and use the CCL, I have a humble suggestion to update all the links provided in the installation as well as other places.
Installations link: Change git clone https://github.com/lorforlinux/BeagleBoard-DeviceTrees.git to git clone https://github.com/beagleboard/BeagleBoard-DeviceTrees.git instead.
Similarly in the rest of the I2C or PWM tutorial blogs as well the links need updating. I can create a PR for this if you approve of my suggestions.