hal: remove connection check for a2dp suspend state update

When a2dp is connected during call, BT framework will set
"A2dpSuspended=true" to audio HAL, but it may not be handled
as sometimes a2dp has not been connected in audio side. Thus
when a2dp connected, a2dp suspend state in HAL is different
with BT side, causing unnecessary audio_check_a2dp_ready calls.

Do not check a2dp connection state in HAL when handling a2dp
suspend state change from upper layer.

CRs-Fixed: 2310792
Change-Id: Iab1cc03433d432ea96b5e96bbcd267f06cce637b