Add the "boards" library

And move all board-specific tweaks there

CL: Add the "boards" library and move all board-specific tweaks there

PUBLISHED_FROM=7f12e4b95cf2fb1db53775d2244bc5c2c2c74837

Author: Deomid Ryabkov

mos.yml

@@ -12,6 +12,7 @@ filesystem:
   - fs
 libs:
     # common mgos libs
+  - origin: https://github.com/mongoose-os-libs/boards
   - origin: https://github.com/mongoose-os-libs/ca-bundle
   - origin: https://github.com/mongoose-os-libs/i2c
   - origin: https://github.com/mongoose-os-libs/rpc-service-config