Correct comment about Verified Boot key on devices with custom root of trust.

Updating the comment to match the test expectation. The attested Verified
Boot key should contain the user-set root of trust if the Verified Boot
state is "SelfSigned" (i.e. "yellow").

Bug: 376832222
Test: n/a (comment update)
Change-Id: Ie3c43157f05e40fa42b107768af561644ff5d30f
diff --git a/security/keymint/aidl/vts/functional/KeyMintAidlTestBase.cpp b/security/keymint/aidl/vts/functional/KeyMintAidlTestBase.cpp
index cfe9fa7..24e796f 100644
--- a/security/keymint/aidl/vts/functional/KeyMintAidlTestBase.cpp
+++ b/security/keymint/aidl/vts/functional/KeyMintAidlTestBase.cpp
@@ -1812,7 +1812,7 @@
         }
     }
 
-    // Verified boot key should be all 0's if the boot state is not verified or self signed
+    // Verified Boot key should be all zeroes if the boot state is "orange".
     std::string empty_boot_key(32, '\0');
     std::string verified_boot_key_str((const char*)verified_boot_key.data(),
                                       verified_boot_key.size());