Add Quality of Service to NNAPI HAL

This CL makes the following changes:
* introduces a new Priority enum
* extends ErrorStatus with new error codes
* adds "supportsDeadline" method to IDevice
* adds priority and deadline arguments to IDevice::prepareModel*
* adds deadline argument to IPreparedModel::execute*
* updates IExecutionCallback with new ErrorStatus
* updates current.txt accordingly

Bug: 136739795
Bug: 142902514
Bug: 145300530
Test: mma
Change-Id: Iaa7877bde1f463635b8bbdb4e8a001d7b79b9c65
diff --git a/neuralnetworks/1.3/IBuffer.hal b/neuralnetworks/1.3/IBuffer.hal
index 84241c5..dfc57fe 100644
--- a/neuralnetworks/1.3/IBuffer.hal
+++ b/neuralnetworks/1.3/IBuffer.hal
@@ -16,7 +16,7 @@
 
 package android.hardware.neuralnetworks@1.3;
 
-import @1.0::ErrorStatus;
+import ErrorStatus;
 
 /**
  * This interface represents a device memory buffer.