Build: Move NS param from common to extra params

NS is enabled by default in most config groups.
Move it to extra params to simplify build config params.

Signed-off-by: Xinyu Zhang <xinyu.zhang@arm.com>
Change-Id: I8adb7fe081ba76e57768bb818ff891fddfbeb956
diff --git a/build_helper/build_helper_config_maps.py b/build_helper/build_helper_config_maps.py
index 009fdd7..c161572 100644
--- a/build_helper/build_helper_config_maps.py
+++ b/build_helper/build_helper_config_maps.py
@@ -57,6 +57,7 @@
 mapExtraParams = {
     # Default
     ""             : "",
+    "NSOFF"        : "-DNS=OFF ",
     # NSCE
     "NSCE"         : "-DTFM_NS_MANAGE_NSID=ON ",
     # MMIO