Add 1.2 NN HAL interface for dynamic output shape.

Let notify_1_2() notify output shapes.

Document unspecified dimensions and rank.

Bug: 73506513
Bug: 77234888
Test: NeuralNetworksTest_static
Test: VtsHalNeuralnetworksV1_xTargetTest with 1.2 sample driver
Change-Id: I01108913212d9f4aa47daf2f293ea19259925865
diff --git a/neuralnetworks/1.0/vts/functional/Callbacks.cpp b/neuralnetworks/1.0/vts/functional/Callbacks.cpp
index a1c5a1a..03afcd0 100644
--- a/neuralnetworks/1.0/vts/functional/Callbacks.cpp
+++ b/neuralnetworks/1.0/vts/functional/Callbacks.cpp
@@ -139,8 +139,10 @@
     return Void();
 }
 
-Return<void> ExecutionCallback::notify_1_2(ErrorStatus errorStatus) {
+Return<void> ExecutionCallback::notify_1_2(ErrorStatus errorStatus,
+                                           const hidl_vec<OutputShape>& outputShapes) {
     mErrorStatus = errorStatus;
+    mOutputShapes = outputShapes;
     CallbackBase::notify();
     return Void();
 }
@@ -150,6 +152,11 @@
     return mErrorStatus;
 }
 
+const std::vector<OutputShape>& ExecutionCallback::getOutputShapes() {
+    wait();
+    return mOutputShapes;
+}
+
 }  // namespace implementation
 }  // namespace V1_2
 }  // namespace neuralnetworks