sound trigger HAL: remove dummy Union

Remove dummy Union definition added as work around for JAVA build
problem.

Bug: 34109137
Test: make
Change-Id: I5a8107de2deab1f4f62c3e0ae654dd768cf0e307
diff --git a/soundtrigger/2.0/types.hal b/soundtrigger/2.0/types.hal
index fc7d019..99bbd56 100644
--- a/soundtrigger/2.0/types.hal
+++ b/soundtrigger/2.0/types.hal
@@ -75,8 +75,3 @@
     vec<ConfidenceLevel> levels;
 };
 
-/** TODO(elaurent) remove when Java build problem is fixed */
-union Dummy {
-  uint32_t dummy1;
-  int32_t dummy2;
-};