Build: Update tf-m-tests commit ID

Update tf-m-tests commit ID to align the latest fix.

Change-Id: I1bc9c9820ca15e20b14a48767a2fbf9f0af6877e
Signed-off-by: David Hu <[email protected]>

Author: David Hu

lib/ext/tf-m-tests/repo_config_default.cmake

@@ -8,5 +8,5 @@
 # Default configs of tf-m-tests repo
 
 set(TFM_TEST_REPO_PATH                  "DOWNLOAD"  CACHE PATH      "Path to TFM-TEST repo (or DOWNLOAD to fetch automatically")
-set(TFM_TEST_REPO_VERSION               "689fee4"   CACHE STRING    "The version of tf-m-tests to use")
+set(TFM_TEST_REPO_VERSION               "5b7a8b2"   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")