tf-m-eclair-daily: Set MBEDTLS_VERSION to empty (detect from CMake files)

Following other jobs.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: Id74fed484349df49722fc26068287ba2e0a77578
diff --git a/tf-m-eclair-daily.yaml b/tf-m-eclair-daily.yaml
index 0cbec5b..b54af05 100644
--- a/tf-m-eclair-daily.yaml
+++ b/tf-m-eclair-daily.yaml
@@ -52,7 +52,7 @@
             No need to change.
       - string:
           name: 'MBEDTLS_VERSION'
-          default: 'mbedtls-3.4.0'
+          default: ''
           description: |
             Specify which MBEDTLS version to use
             refs/heads/<branch_name> : Pick up latest HEAD on branch