Add missing comma to linux,initrd-start|end

Missing comma seems to not ignore the test properly.

Bug: 392106640
Test: atest MicrodroidHostTestCases
Change-Id: I426870fac680e722a62a8906181e1dc2b04fe882
diff --git a/tests/backcompat_test/src/main.rs b/tests/backcompat_test/src/main.rs
index bf0afa6..aa69eec 100644
--- a/tests/backcompat_test/src/main.rs
+++ b/tests/backcompat_test/src/main.rs
@@ -160,9 +160,9 @@
         .arg("--ignore-path-value")
         .arg("/avf/untrusted/instance-id")
         .arg("--ignore-path-value")
-        .arg("/chosen/linuxinitrd-start")
+        .arg("/chosen/linux,initrd-start")
         .arg("--ignore-path-value")
-        .arg("/chosen/linuxinitrd-end")
+        .arg("/chosen/linux,initrd-end")
         .arg("--ignore-path-value")
         .arg("/avf/secretkeeper_public_key")
         .arg("--ignore-path")