Replace usage of "vector<>" with "std::vector<>"

This change is needed so we can remove the last instances
of "using std::vector" statements in hardware/libhardware.

Test: code compilation
Change-Id: I6a9fc62152371d1bba6ead71e7ff8c2610799637
diff --git a/service/gatt_server.cc b/service/gatt_server.cc
index 1d59773..e4a6ec5 100644
--- a/service/gatt_server.cc
+++ b/service/gatt_server.cc
@@ -297,7 +297,7 @@
 
 void GattServer::ServiceAddedCallback(hal::BluetoothGattInterface* gatt_iface,
                                       int status, int server_id,
-                                      vector<btgatt_db_element_t> svc) {
+                                      std::vector<btgatt_db_element_t> svc) {
   lock_guard<mutex> lock(mutex_);
 
   if (server_id != server_id_) return;
@@ -407,7 +407,7 @@
 void GattServer::RequestWriteCharacteristicCallback(
     hal::BluetoothGattInterface* /* gatt_iface */, int conn_id, int trans_id,
     const bt_bdaddr_t& bda, int attr_handle, int offset, bool need_rsp,
-    bool is_prep, vector<uint8_t> value) {
+    bool is_prep, std::vector<uint8_t> value) {
   lock_guard<mutex> lock(mutex_);
 
   // Check to see if we know about this connection. Otherwise ignore the
@@ -446,7 +446,7 @@
 void GattServer::RequestWriteDescriptorCallback(
     hal::BluetoothGattInterface* /* gatt_iface */, int conn_id, int trans_id,
     const bt_bdaddr_t& bda, int attr_handle, int offset, bool need_rsp,
-    bool is_prep, vector<uint8_t> value) {
+    bool is_prep, std::vector<uint8_t> value) {
   lock_guard<mutex> lock(mutex_);
 
   // Check to see if we know about this connection. Otherwise ignore the