Add vendor version for libgui

libstagefright_omx library need to be extended to vendor which
is depenednet on libgui which is a vndk_private lib.
Creating vendor version so that libstagefright_omx_ext can link
to libgui_vendor.

CRs-Fixed: 2258968
Change-Id: I777eebffc405c8bb74aab270e9f272c806501458

libs/gui/Android.bp

@@ -308,9 +308,8 @@ cc_defaults {
     ],
 }
 
-cc_library_shared {
-    name: "libgui",
-    vendor_available: true,
+cc_defaults {
+    name: "libgui_defaults",
     double_loadable: true,
 
     defaults: [
@@ -353,6 +352,18 @@ cc_library_shared {
     ],
 }
 
+cc_library_shared {
+    name: "libgui",
+    vendor_available: true,
+    defaults: ["libgui_defaults"]
+}
+
+cc_library {
+    name: "libgui_vendor",
+    vendor: true,
+    defaults: ["libgui_defaults"],
+}
+
 // Used by media codec services exclusively as a static lib for
 // core bufferqueue support only.
 cc_library_static {