libopie2: remove DEFAULT_PREFERENCE of -1 from git version
libopie2: remove DEFAULT_PREFERENCE of -1 from git version

This is not necessary if you use the appropriate include file to select
the Opie version (which is mandatory), and this also makes the libopie2
recipe consistent with the other Opie recipes, none of which set
DEFAULT_PREFERENCE.

Signed-off-by: Paul Eggleton <737d4dae46a541673d7bf4e0d5b32714b16528d8@linux.intel.com>

bluelightning/meta-opie,bluelightning/meta-opie,bluelightning/meta-opie,bluelightning/meta-opie,bluelightning/meta-opie