tf-a-eclair-delta: Add GERRIT_CHANGE_NUMBER GERRIT_PATCHSET_NUMBER params

Useful for testing Gerrit comment posting fuctionality.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: I56796ac3d326dc4b991129d34ab1a45b86cb8950
diff --git a/tf-a-eclair-delta.yaml b/tf-a-eclair-delta.yaml
index 8d2b442..6748d37 100644
--- a/tf-a-eclair-delta.yaml
+++ b/tf-a-eclair-delta.yaml
@@ -46,6 +46,12 @@
             name: GERRIT_REFSPEC
             default: ''
         - string:
+            name: GERRIT_CHANGE_NUMBER
+            default: ''
+        - string:
+            name: GERRIT_PATCHSET_NUMBER
+            default: ''
+        - string:
             name: MBEDTLS_URL
             default: 'https://github.com/ARMmbed/mbedtls/archive/mbedtls-2.28.0.tar.gz'
             description: |