Chip-select and SPI initialization uses the new config, whereas the drivers
still use the existing defines.
The configuration in board_config.h can be removed after all drivers are
updated.
Adds a single file definition to provide a single point to add
new tunes and clearly understand, the useage: it need to be
stopped will it not allow interruption.
This adds a src/board/<bebop|eagle|excelsior|rpi|sitl>/board_config.h
to configure the build as is done with the Nuttx targets
src/platforms/posix/include/board_config.h has been renamed to
src/platforms/posix/include/system_config.h to allow the common
posix defines to be included with the board specific defines.
mcsauder
Beat Küng
David Sidrane
Simone Guscetti
Lorenz Meier
Thomas Gubler
Lorenz Meier
Simon Wilks
px4dev
jgoppert