Build : Update tf-m-tests repo version

Update tf-m-tests repo version to adfe6c1.

Change-Id: Ifbc9eaa4f18054697c059cbcdb667a4f4c305433
Signed-off-by: Mingyang Sun <mingyang.sun@arm.com>
diff --git a/config/config_default.cmake b/config/config_default.cmake
index 52599d1..c636079 100644
--- a/config/config_default.cmake
+++ b/config/config_default.cmake
@@ -185,7 +185,7 @@
 set(TFM_MBEDCRYPTO_PLATFORM_EXTRA_CONFIG_PATH "" CACHE PATH "Config to append to standard Mbed Crypto config, used by platforms to cnfigure feature support")
 
 set(TFM_TEST_REPO_PATH                  "DOWNLOAD"  CACHE PATH      "Path to TFM-TEST repo (or DOWNLOAD to fetch automatically")
-set(TFM_TEST_REPO_VERSION               "d4600a4"   CACHE STRING    "The version of tf-m-tests to use")
+set(TFM_TEST_REPO_VERSION               "adfe6c1"   CACHE STRING    "The version of tf-m-tests to use")
 set(CMSIS_5_PATH                        "DOWNLOAD"  CACHE PATH      "Path to CMSIS_5 (or DOWNLOAD to fetch automatically")
 
 set(MCUBOOT_PATH                        "DOWNLOAD"        CACHE PATH      "Path to MCUboot (or DOWNLOAD to fetch automatically")