BTM_PM: Try other pending changes when current one failed

When we receive a non-SUCCESS command status for pm change, we should
not stop here; there might be some other pending pm changes in the
queue.  We need to try the remaining ones.

Test: Disconnect a device when there is a pending PM change
Tag: #stability
Bug: 180842489
Bug: 184095368
Change-Id: I31a6f96cd3b47e671141c29801f4d7397787fc51
Merged-In: I31a6f96cd3b47e671141c29801f4d7397787fc51