Consolidate the VOXL2 SLPI (DSP) board from a separate directory into
the existing voxl2 board as a variant. Multi-processor SoCs like the
QRB5165 should use one board directory with multiple .px4board files
rather than separate directories per processor.
Changes:
- Add slpi.px4board (QURT/DSP) alongside default.px4board (POSIX/apps)
- Merge board_config.h with __PX4_QURT / __PX4_POSIX preprocessor guards
- Merge CMakeLists.txt with PX4_PLATFORM conditionals
- Split bus definitions into platform-specific files (i2c/spi_posix/qurt)
- Reorganize drivers into drivers/posix/ and drivers/qurt/ subdirectories
- Guard cmake/init.cmake and cmake/link_libraries.cmake for posix-only
- Update build and install scripts for new target names
- Delete boards/modalai/voxl2-slpi/ entirely
Build targets change:
- modalai_voxl2-slpi_default -> modalai_voxl2_slpi
- modalai_voxl2_default (unchanged)
Signed-off-by: Ramon Roche <mrpollo@gmail.com>