LIB: Update tests to use new logging API

Update secure runtime tests to use the new unprivileged logging API in
place of the SPM log API they were using previously.

Change-Id: I092e6ca54523cf5a7cefc866c07cbe60434f1b9d
Signed-off-by: Jackson Cooper-Driver <jackson.cooper-driver@arm.com>
diff --git a/docs/tfm_erpc_test_build_and_run.rst b/docs/tfm_erpc_test_build_and_run.rst
index 920e3f2..ddf539c 100644
--- a/docs/tfm_erpc_test_build_and_run.rst
+++ b/docs/tfm_erpc_test_build_and_run.rst
@@ -52,7 +52,7 @@
 +-------------------------+-------------------------------------+
 | TFM_SPM_LOG_LEVEL       | ``TFM_SPM_LOG_LEVEL_SILENCE``       |
 +-------------------------+-------------------------------------+
-| TFM_PARTITION_LOG_LEVEL | ``TFM_PARTITION_LOG_LEVEL_SILENCE`` |
+| TFM_PARTITION_LOG_LEVEL | ``LOG_LEVEL_NONE``                  |
 +-------------------------+-------------------------------------+
 
 Execute tests on TC3 FVP with TCP Transport