Add timeout handler for browser subscription callback function

This patch is to add a timeout handler to avoid the BrowserSubscriptionCallback doesn't be called on time

Tag: #stability
Bug: 196683375
Test: atest BluetoothInstrumentationTests
Change-Id: I9f285115ea2851078843192349705a382e5c5613
Merged-In: I9f285115ea2851078843192349705a382e5c5613