build_helper_configs: Remove dup entry for "debug" config

Already present 2 lines above.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: I4fc7f1ff88b412d869f57a8caf65f86e01346070
diff --git a/build_helper/build_helper_configs.py b/build_helper/build_helper_configs.py
index 30472e1..cb40125 100755
--- a/build_helper/build_helper_configs.py
+++ b/build_helper/build_helper_configs.py
@@ -1525,7 +1525,6 @@
                     "doxygen": config_doxygen,
                     "debug": config_debug,
                     "release": config_release,
-                    "debug": config_debug,
 
                     #DevOps team test group
                     "lava_debug": config_lava_debug,