Update KeyMint VTS tests to use pre-defined API level symbols

Test: VtsKeyMintAidlTargetTest
Change-Id: I11ccd0c4959a2b3504009fdd95f4a313a5d6d5f6
diff --git a/security/keymint/aidl/vts/functional/AttestKeyTest.cpp b/security/keymint/aidl/vts/functional/AttestKeyTest.cpp
index 8027dce..bbf3633 100644
--- a/security/keymint/aidl/vts/functional/AttestKeyTest.cpp
+++ b/security/keymint/aidl/vts/functional/AttestKeyTest.cpp
@@ -106,7 +106,7 @@
         // with any other key purpose, but the original VTS tests incorrectly did exactly that.
         // This means that a device that launched prior to Android T (API level 33) may
         // accept or even require KeyPurpose::SIGN too.
-        if (property_get_int32("ro.board.first_api_level", 0) < 33) {
+        if (property_get_int32("ro.board.first_api_level", 0) < __ANDROID_API_T__) {
             AuthorizationSet key_desc_plus_sign = key_desc;
             key_desc_plus_sign.push_back(TAG_PURPOSE, KeyPurpose::SIGN);