Lower the BLE connection supervision timeout to 5s.

This is the other part of the original change
(https://android-review.googlesource.com/333843) to lower the
connection supervision timeout to 5s.

This will take effect when an app requests a connection parameter
update through BluetoothGatt's requestConnectionPriority method after
the BLE connection has been established.

This makes sure that we do not revert back to a connection supervision
timeout of 20s in case the requestConnectionPriority method is called.

Change-Id: I66cdfcdd7b390b2858a4ab4362debc87bba45978
diff --git a/src/com/android/bluetooth/gatt/GattService.java b/src/com/android/bluetooth/gatt/GattService.java
index fd8551a..25c30d0 100644
--- a/src/com/android/bluetooth/gatt/GattService.java
+++ b/src/com/android/bluetooth/gatt/GattService.java
@@ -2457,7 +2457,7 @@
         int latency;
         // Link supervision timeout is measured in N * 10ms
-        int timeout = 2000; // 20s
+        int timeout = 500; // 5s
         switch (connectionPriority) {
             case BluetoothGatt.CONNECTION_PRIORITY_HIGH: