leaudio: Improve set autoconnect on the Bluetooth On

If at least one of the device has autoconnect flag set to true, all the
group members will get into auto connect

Bug: 263069663
Test: atest BluetoothInstrumentationTests
Tag: #feature
Merged-In: I60ac5864d20cbfd2f139872b66294f5045045b4f
Change-Id: I60ac5864d20cbfd2f139872b66294f5045045b4f
(cherry picked from commit 8248277a)