CI Build: Use Space as Default Value for PROFILE Param

Jenkins does not allow null value for params.
Space is used as default value for PROFILE param in build command.

Change-Id: I735d9ae1611b29bca85d2f71a9e8277fffe513dc
Signed-off-by: Xinyu Zhang <xinyu.zhang@arm.com>
diff --git a/tfm_ci_pylib/tfm_build_manager.py b/tfm_ci_pylib/tfm_build_manager.py
index 0a52d86..b699b54 100644
--- a/tfm_ci_pylib/tfm_build_manager.py
+++ b/tfm_ci_pylib/tfm_build_manager.py
@@ -100,7 +100,7 @@
             "OTP={}",
             "BL2={}",
             "NS={}",
-            "PROFILE={}"
+            "PROFILE={} "
         ]
         print(
             "\n".join(argument_list)