AVRCP controller browsing deep copy and get folder range

AVRCP browsing was unstable on the sink side due to bytes
being used instead of integers for get_folder_items_cmd
and a lack of deep copy in the data buffers.  This patch
allows both browse and vendor commands to work correctly.

Bug: 72496280
Test: stream music and browse at the same time.
Change-Id: Id4d34101c918947450923b68e087e6851ce99130