User allocated EVS camera capture buffers

This change introduces a new API to import frame capture buffers
allocated by the clients.

Bug: 152493110
Test: m -j and run /system/bin/evs_app --test --extmem
Change-Id: I679c61719e4d0e3a7d0c41110afe66e0a4ccb305
diff --git a/automotive/evs/1.1/default/EvsCamera.cpp b/automotive/evs/1.1/default/EvsCamera.cpp
index 5196c95..0e69ed4 100644
--- a/automotive/evs/1.1/default/EvsCamera.cpp
+++ b/automotive/evs/1.1/default/EvsCamera.cpp
@@ -354,6 +354,14 @@
 }
 
 
+Return<void>
+EvsCamera::importExternalBuffers(const hidl_vec<BufferDesc_1_1>& /* buffers */,
+                                 importExternalBuffers_cb _hidl_cb) {
+    ALOGW("%s is not implemented yet.", __FUNCTION__);
+    _hidl_cb(EvsResult::UNDERLYING_SERVICE_ERROR, 0);
+    return {};
+}
+
 
 bool EvsCamera::setAvailableFrames_Locked(unsigned bufferCount) {
     if (bufferCount < 1) {