const-ify uint16_t hci::acl_manager::le_acl_connection::connection_handle_

Bug: 187830698
Test: gd/cert/run
Tag: #refactor

Change-Id: Ibf4fbc628ad43c0de616b13bb33f44f40f5707e2

system/gd/hci/acl_manager/le_acl_connection.cc

@@ -93,7 +93,7 @@ class LeAclConnectionTracker : public LeConnectionManagementCallbacks {
   os::Handler* client_handler_ = nullptr;
   LeConnectionManagementCallbacks* client_callbacks_ = nullptr;
   std::list<common::OnceClosure> queued_callbacks_;
-  uint16_t connection_handle_;
+  const uint16_t connection_handle_;
 };
 
 struct LeAclConnection::impl {