message: sdk: src: readme.md: update documentation
  The sdk now supports two target platforms: the Dragonboard and the Raspberry Pi
diff: @@ -6,7 +6,7 @@ Container for SDK source and header files
  #### Directory Structure
  | Directory/File | Description |
  | --------- | ----------- |
  -| dragonboard | Directory containing Dragonboard specific files |
  +| target | Directory containing Dragonboard and Raspberry Pi specific files |
  | linux | Directory containing Linux host specific files |
  | macos | Directory containing MacOS host specific files |
  | windows | Directory containing Windows host specific files |
  