AVRCP_Browse: Serialize SetBrowse & GetFolderItem rsp

Some remote devices blindly sends SetBrowsePlayer and
GetFolderItems VFS cmds back to back without awaiting
SetBrowsePlayer rsp. And later never ask GetFolderitem
leading no browsing. This fix lets await GetFolderItem
rsp until DUT respond SetBrowsePlayer command first.

CRs-Fixed: 2558410
Change-Id: Iad6bdf370b971175224acf43c59ec2b72da83d18
1 file changed