use a precondition var in soundtrigger.

Test: make vts BUILD_GOOGLE_VTS=true -j32 && vts-tradefed run
commandAndExit vts --skip-all-system-status-check --primary-abi-only
--skip-preconditions --module HalSoundTriggerHidlTargetBasicTest -l INFO
Fixes: 34256132

Change-Id: Iab82492503d57a589fd3bed3db609a67064ec98b
diff --git a/soundtrigger/2.0/vts/functional/vts/testcases/hal/soundtrigger/hidl/target/AndroidTest.xml b/soundtrigger/2.0/vts/functional/vts/testcases/hal/soundtrigger/hidl/target/AndroidTest.xml
index ca8ecdb..9339165 100644
--- a/soundtrigger/2.0/vts/functional/vts/testcases/hal/soundtrigger/hidl/target/AndroidTest.xml
+++ b/soundtrigger/2.0/vts/functional/vts/testcases/hal/soundtrigger/hidl/target/AndroidTest.xml
@@ -25,7 +25,8 @@
             _64bit::DATA/nativetest64/soundtrigger_hidl_hal_test/soundtrigger_hidl_hal_test,
             "/>
         <option name="test-config-path" value="vts/testcases/hal/soundtrigger/hidl/target/HalSoundTriggerHidlTargetBasicTest.config" />
-        <option name="binary-test-type" value="gtest" />
+        <option name="binary-test-type" value="hal_hidl_gtest" />
+        <option name="precondition-file-path-prefix" value="*/lib/hw/sound_trigger.primary." />
         <option name="test-timeout" value="1m" />
     </test>
 </configuration>