Use -Werror in frameworks/native/libs/vr

* Suppress/fix warnings of unused variable, parameter,
  private-field, and function.
* Fix warnings about typedef missing declarator.
* Use -Wno-error to keep existing warnings, to fix later.

Bug: 66996870
Test: build with WITH_TIDY=1
Change-Id: Iae96af3f6a17623befe73a9db2c81275fee44fa6
diff --git a/libs/vr/libvrsensor/Android.bp b/libs/vr/libvrsensor/Android.bp
index d022adf..e92178a 100644
--- a/libs/vr/libvrsensor/Android.bp
+++ b/libs/vr/libvrsensor/Android.bp
@@ -42,6 +42,11 @@
 
 cc_library {
     srcs: sourceFiles,
+    cflags: [
+        "-Wall",
+        "-Werror",
+        "-Wno-macro-redefined",
+    ],
     export_include_dirs: includeFiles,
     static_libs: staticLibraries,
     shared_libs: sharedLibraries,
diff --git a/libs/vr/libvrsensor/include/dvr/pose_client.h b/libs/vr/libvrsensor/include/dvr/pose_client.h
index d684ddc..6a9437c 100644
--- a/libs/vr/libvrsensor/include/dvr/pose_client.h
+++ b/libs/vr/libvrsensor/include/dvr/pose_client.h
@@ -7,7 +7,7 @@
 #ifndef __FLOAT32X4T_86
 #define __FLOAT32X4T_86
 typedef float float32x4_t __attribute__ ((__vector_size__ (16)));
-typedef struct float32x4x4_t { float32x4_t val[4]; };
+typedef struct float32x4x4_t { float32x4_t val[4]; } float32x4x4_t;
 #endif
 #endif