Change bind library to fix Floss build

<base/bind.h> -> <base/functional/bind.h>

Bug: 2645131
Test: mma -j32
Test: ./build-in-container.py
Change-Id: I1a4934c7821ad256e65218bd872098b3c6f6acbe
diff --git a/system/gd/common/i_postable_context.h b/system/gd/common/i_postable_context.h
index 231eca7..c172970 100644
--- a/system/gd/common/i_postable_context.h
+++ b/system/gd/common/i_postable_context.h
@@ -16,7 +16,7 @@
 
 #pragma once
 
-#include <base/bind.h>
+#include <base/functional/bind.h>
 
 namespace bluetooth {
 namespace common {