Generate binaries for all executables

Add helper to generate binaries for all targets added with
ethosu_add_executable in order to ease development on fpga.

Change-Id: I23df4f8aa1fd2d8a1e633d337b9f09ad7fe75774
diff --git a/targets/corstone-300/CMakeLists.txt b/targets/corstone-300/CMakeLists.txt
index e791cfd..a9e69ec 100644
--- a/targets/corstone-300/CMakeLists.txt
+++ b/targets/corstone-300/CMakeLists.txt
@@ -42,6 +42,8 @@
 
 include(${CMAKE_CURRENT_SOURCE_DIR}/../../cmake/helpers.cmake)
 
+set(SCRIPTS_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../../scripts)
+
 #############################################################################
 # Corstone-300
 #############################################################################