Remove unused dependencies

Also export libui headers since files like ConsumerBase.h depend on
symbols from that library.

Bug: 32208916
Test: Compiles for bullhead_treble-userdebug

Change-Id: I7148ee908f8115f6125b2d6971788709fbcf6202
diff --git a/libs/gui/Android.bp b/libs/gui/Android.bp
index 9e9799b..9ba85a6 100644
--- a/libs/gui/Android.bp
+++ b/libs/gui/Android.bp
@@ -104,7 +104,7 @@
         "liblog",
     ],
 
-    export_shared_lib_headers: ["libbinder"],
+    export_shared_lib_headers: ["libbinder", "libui"],
 }
 
 subdirs = ["tests"]