Run a file system on the Dragonfly's SPI Flash.

Dependencies:   SpiFlash25 flash-fs

Revision:
0:54ec26dc283f
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flash-fs.lib	Fri Jun 26 16:49:06 2020 -0500
@@ -0,0 +1,1 @@
+https://os.mbed.com/teams/MultiTech/code/flash-fs/#7a3c79b0d570