SurfaceFlinger: Get rid of String8 in dumpsys

Test: build and gui/ui/renderengine/surfaceflinger tests and compare
dumpsys SurfaceFlinger results
Change-Id: Iafdaf73a0acbbbb8fbafc930ad86285106a07e13
diff --git a/libs/gui/Android.bp b/libs/gui/Android.bp
index 908eee9..d1c732b 100644
--- a/libs/gui/Android.bp
+++ b/libs/gui/Android.bp
@@ -122,6 +122,7 @@
 
     shared_libs: [
         "android.hardware.graphics.common@1.1",
+        "libbase",
         "libsync",
         "libbinder",
         "libbufferhub",