Move A2DP Sink Timeout in line with other profiles

This change updates the A2DP Sink connection timeout from 5000ms to
10000ms, to be in line with the other connection state timeouts of
profiles like HFP Client, MAP Client and PBAP Client.

Tag: #stability
Bug: 254924086
Test: atest BluetoothInstrumentationTests
Change-Id: I36bf1d724ae6c556a8580fa5b0eb430096c4d8cd