Reserves memory for external buffers

This change adds a line to reserve memory to hold externally
allocated EVS frame buffers for CameraStreamExternalBuffering test.

Fix: 159399273
Test: vts-tradefed run commandAndExit -m VtsHalEvsV1_1TargetTest
Change-Id: I9e6b29580ac8357efd32b8fec434456e40cbaa58
diff --git a/automotive/evs/1.1/vts/functional/VtsHalEvsV1_1TargetTest.cpp b/automotive/evs/1.1/vts/functional/VtsHalEvsV1_1TargetTest.cpp
index 6a386c3..8b68fd6 100644
--- a/automotive/evs/1.1/vts/functional/VtsHalEvsV1_1TargetTest.cpp
+++ b/automotive/evs/1.1/vts/functional/VtsHalEvsV1_1TargetTest.cpp
@@ -2262,6 +2262,7 @@
 
     // Allocate buffers to use
     hidl_vec<BufferDesc> buffers;
+    buffers.resize(kBuffersToHold);
     for (auto i = 0; i < kBuffersToHold; ++i) {
         unsigned pixelsPerLine;
         buffer_handle_t memHandle = nullptr;