package/xbmc-pvr-addons: rename to 'kodi-pvr-addons'

Following the rename of the XBMC project to Kodi, this commit renames
the xbmc-pvr-addons package to kodi-pvr-addons, and adds the
appropriate Config.in.legacy handling.

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>