tfm_builder.py: Moved CMAKE configs

* CMAKE configurations now reside inside ./configs directory
* This patch updates the build path of the CI to support
  the tfm code-base change.

Change-Id: I81a57b261bd3956ef898864736c7a7017aeb01e3
Signed-off-by: Minos Galanakis <minos.galanakis@linaro.org>
diff --git a/tfm_ci_pylib/tfm_builder.py b/tfm_ci_pylib/tfm_builder.py
index 07ed776..8750abf 100644
--- a/tfm_ci_pylib/tfm_builder.py
+++ b/tfm_ci_pylib/tfm_builder.py
@@ -111,6 +111,7 @@
 
         # Append the path for the config
         self._tfb_cfg["PROJ_CONFIG"] = os.path.join(self._tfb_tfm_dir,
+                                                    "configs",
                                                     self._tfb_cfg[("PROJ_"
                                                                    "CONFIG")])