Set default value of A2DP HW offload toggle

When developer options is disabled, A2DP HW offload toggle
will switch to default value, we should decide default value
according to A2DP HW offload is supported of not.

Bug: 63932139
Bug: 79568680
Test: robotests
Change-Id: I3bf941edd3c0e0f70cfba32dc856e3f14fee07fa
1 file changed