Use ro.board.api_level to check whether BSP is under VSR-15 or not

Non-GRF devices upgrading their vendor to Android 15 should support AVF.

Bug: 340429921
Test: run MicrodroidTestApp on upgrading Pixels
Change-Id: I7bd69b4c4f6b9d8ab21e7a9e80d7a370fe6ada6f
diff --git a/tests/helper/src/java/com/android/microdroid/test/device/MicrodroidDeviceTestBase.java b/tests/helper/src/java/com/android/microdroid/test/device/MicrodroidDeviceTestBase.java
index 6040531..e02db39 100644
--- a/tests/helper/src/java/com/android/microdroid/test/device/MicrodroidDeviceTestBase.java
+++ b/tests/helper/src/java/com/android/microdroid/test/device/MicrodroidDeviceTestBase.java
@@ -219,7 +219,7 @@
     }
 
     protected static int getVendorApiLevel() {
-        return SystemProperties.getInt("ro.vendor.api_level", 0);
+        return SystemProperties.getInt("ro.board.api_level", 0);
     }
 
     protected void assumeSupportedDevice() {
diff --git a/tests/hostside/helper/java/com/android/microdroid/test/host/MicrodroidHostTestCaseBase.java b/tests/hostside/helper/java/com/android/microdroid/test/host/MicrodroidHostTestCaseBase.java
index c6b2499..b7ac827 100644
--- a/tests/hostside/helper/java/com/android/microdroid/test/host/MicrodroidHostTestCaseBase.java
+++ b/tests/hostside/helper/java/com/android/microdroid/test/host/MicrodroidHostTestCaseBase.java
@@ -140,7 +140,7 @@
         assumeTrue("Requires VM support", testDevice.supportsMicrodroid());
 
         CommandRunner android = new CommandRunner(androidDevice);
-        long vendorApiLevel = androidDevice.getIntProperty("ro.vendor.api_level", 0);
+        long vendorApiLevel = androidDevice.getIntProperty("ro.board.api_level", 0);
         boolean isGsi =
                 android.runForResult("[ -e /system/system_ext/etc/init/init.gsi.rc ]").getStatus()
                         == CommandStatus.SUCCESS;