TestGpuNnapi: add missing sType for VkExternalBufferProperties

Bug: 255226937
Test: atest CtsNNAPITestCases:GpuNnapiTest
Change-Id: I6b33f139619da1d699fe2cff7510aba8fd8bccfe

runtime/test/TestGpuNnapi.cpp

diff --git a/runtime/test/TestGpuNnapi.cpp b/runtime/test/TestGpuNnapi.cpp
index 333d867..7d50321 100644
--- a/runtime/test/TestGpuNnapi.cpp
+++ b/runtime/test/TestGpuNnapi.cpp
@@ -432,7 +432,9 @@
                 .usage = VK_BUFFER_USAGE_STORAGE_BUFFER_BIT,
                 .handleType = VK_EXTERNAL_MEMORY_HANDLE_TYPE_ANDROID_HARDWARE_BUFFER_BIT_ANDROID,
         };
-        VkExternalBufferProperties externalBufferProperties;
+        VkExternalBufferProperties externalBufferProperties = {
+                .sType = VK_STRUCTURE_TYPE_EXTERNAL_BUFFER_PROPERTIES,
+        };
         vkGetPhysicalDeviceExternalBufferProperties(mPhysicalDevice, &externalBufferInfo,
                                                     &externalBufferProperties);
         if (!(externalBufferProperties.externalMemoryProperties.externalMemoryFeatures &