AVRCP_Browse: NPE Fixes & improvements in BrowseMediaPlayer

- Fix NPE & other probable crash issues in BrowseMediaPlayer

- Don't try re-connection with MBS upon package updates for
players which are already in Browsable Player list.

- Upon removal/uninstalling a package remove it from the list
of Browsable Player list if exists.

- Don't entertain MBS connection updates after 3 sec timeout.

Change-Id: I8e76d72e3eeda25b8505c9e0a69c3471c72e9712
2 files changed