Remove unnecessary includes, in particular the includes for specific
boards. The list of libraries for 'polygon' example was updated so that
the example compiles again.
Instead of requiring every program to specify the HAL related modules,
let the build system do it (in practice everything we compiled depended
on HAL anyway). This allow including only the necessary files in the
compilation.
Siddharth Bharat Purohit
Lucas De Marchi
Caio Marcelo de Oliveira Filho
Andrew Tridgell