Add flash support for boards using latest SDK

Using the latest SDK (0.7.2) you can flash directly using make
by specifying the board, for example

make BOARD=arduino_101 flash

This will build and flash the generated binary to the board.

Change-Id: I90254abd69874efbb449ef318079958980c23074
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
14 files changed