Add TI library support

• Grab some of the nice stuff from here https://github.com/FredEckert/bbai64_cortex-r5_example/tree/r5_toggle
• Write a simple example that uses the TI RTOS PDK libraries from https://www.ti.com/tool/download/PROCESSOR-SDK-LINUX-SK-TDA4VM/09.01.00.06 to control GPIO. Maybe also write some other examples, SPI or something.

Rework the Makefile and linker script as needed. Improve or replace the startup and stop scripts. Write some documentation on how to compile and link the TI libraries. Make sure to document what you are doing with device tree overlays, the Kernel you tested things on, and your BeagleBone firmware version.