display: Add display_intf_headers header library

Change-Id: I46c7be0f981e3d7edffe025f08a9545e4bea170f
diff --git a/Android.bp b/Android.bp
index 0119165..bc72fd6 100644
--- a/Android.bp
+++ b/Android.bp
@@ -33,6 +33,19 @@
     export_header_lib_headers: ["libhardware_headers"],
 }
 
+cc_library_headers {
+    name: "display_intf_headers",
+    vendor_available: true,
+    export_include_dirs: [
+        "include",
+        "libcopybit",
+        "libqdutils",
+        "gralloc",
+    ],
+    header_libs: ["libhardware_headers"],
+    export_header_lib_headers: ["libhardware_headers"],
+}
+
 subdirs = [
     "libqservice",
     "libqdutils",