Add basic dvrSurface C API

Test: Build and flash system
Bug: 36563654
Change-Id: Id6c79d33d80e719b1d1d7f43aec99aadfad40c03
diff --git a/libs/vr/libdvr/dvr_api.cpp b/libs/vr/libdvr/dvr_api.cpp
index 4dd49da..5aa9652 100644
--- a/libs/vr/libdvr/dvr_api.cpp
+++ b/libs/vr/libdvr/dvr_api.cpp
@@ -77,6 +77,8 @@
 
     // dvr_surface.h
     dvr_api->get_pose_buffer_ = dvrGetPoseBuffer;
+    dvr_api->surface_create_ = dvrSurfaceCreate;
+    dvr_api->surface_get_write_buffer_queue_ = dvrSurfaceGetWriteBufferQueue;
 
     // vsync_client_api.h
     dvr_api->vsync_client_create_ = dvr_vsync_client_create;