Moves where flash.jlink is defined

This means it will hopefully be found by the program, otherwise will need to
find a different way to create the file.

Change-Id: I29a2f081d9520d5e3102fcd50a580df06ad5c1a3
Signed-off-by: Matthew Dalzell <matthew.dalzell@arm.com>
diff --git a/build_helper/build_helper_configs.py b/build_helper/build_helper_configs.py
index da787d1..d7040c8 100755
--- a/build_helper/build_helper_configs.py
+++ b/build_helper/build_helper_configs.py
@@ -173,12 +173,12 @@
                                            # Workaround for flash_JLink.py
                                            "cp %(ci_build_root_dir)s/spe/bin/tfm_s.hex %(codebase_root_dir)s/build/bin ;"
                                            "cp %(ci_build_root_dir)s/nspe/bin/tfm_ns.hex %(codebase_root_dir)s/build/bin ;"
+                                           "cd %(codebase_root_dir)s/build/bin;"
                                            "if [ -f \"%(ci_build_root_dir)s/spe/bin/bl2.hex\" ]; then "
                                            "echo r >> flash.jlink; echo erase >> flash.jlink; echo loadfile bl2.hex >> flash.jlink; echo loadfile tfm_s_ns_signed.bin -0x8000 >> flash.jlink; echo r >> flash.jlink; echo go >> flash.jlink; echo exit >> flash.jlink; "
                                            "else "
                                            "echo r >> flash.jlink; echo erase >> flash.jlink; echo loadfile tfm_s.hex >> flash.jlink; echo loadfile tfm_ns.hex >> flash.jlink; echo r >> flash.jlink; echo go >> flash.jlink; echo exit >> flash.jlink; "
                                            "fi;"
-                                           "cd %(codebase_root_dir)s/build/bin;"
                                            "BIN_FILES=$(grep loadfile flash.jlink | awk '{print $2}');"
                                            "tar jcf lpcxpresso55s69-tfm.tar.bz2 flash.jlink ${BIN_FILES};"
                                            "mv lpcxpresso55s69-tfm.tar.bz2 %(ci_build_root_dir)s/nspe/bin ;"