* Set up Bonsai C4 as a platform board file
* corrections and improvements based on testing and feedback
* Added VBUS sensing as default capability for improved split support using Bonsai C4
* Update clock divisor for SPI flash
Co-authored-by: Nick Brassel <nick@tzarc.org>
Co-authored-by: Nick Brassel <nick@tzarc.org>
David Hoelscher