Includes a missing semi-colon

Adds a semi-colon which had been forgotten about.

Change-Id: I3047e52bd7f730e4ad5e0f432280846b89d2eede
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 3a1a61b..6ee266e 100755
--- a/build_helper/build_helper_configs.py
+++ b/build_helper/build_helper_configs.py
@@ -142,7 +142,7 @@
                                           "image_signing/scripts/tfm_ns_signed.bin ;"
                                           "popd"),
                    "nxp/lpcxpresso55s69": ("echo 'LPCXpresso55S69 board post process\n';"
-                                           "pip3 install --upgrade pyocd "  # this is experimental, remove
+                                           "pip3 install --upgrade pyocd; "  # this is experimental, remove
                                            "pyocd erase --mass -t LPC55S69 ; "
                                            "if [ -f \"%(ci_build_root_dir)s/spe/bin/bl2.hex\" ]; then "
                                            "pyocd flash %(ci_build_root_dir)s/spe/bin/bl2.hex -t LPC55S69; "