hal: Reset A2DP backend before SCO is started

SCO and A2DP share the same Slimbus backend.
During A2DP to SCO transition, A2DP sound device in
audio HAL if disabled after SCO audio route is enabled
overwrites SCO backend config with A2DP reset config.
Reset A2DP config with A2DP suspension rather than
wait for it to be handled from stop playback.
Don't reset backend if stop playback is called
while A2DP is suspended.
Also, set/reset slimbus TX config only when usecase is
LDAC ABR.

Bug: 80647629
Test: Manual
Change-Id: Idc80617aabb6d94d325dc7cad75099272a4582e5