arago-tisdk-dspsdk-sdk-host: Add Serial Flasher to host utils.

Signed-off-by: Daniel Diaz <ddiaz@ti.com>
arago-tisdk-dspsdk-sdk-host: Do not include board-port-labs.

Signed-off-by: Daniel Diaz <ddiaz@ti.com>
arago-tisdk-dspsdk-sdk-host: Add DSPSDK example apps.

Signed-off-by: Daniel Diaz <ddiaz@ti.com>