layer.conf: add OPIE_GIT_DIR
layer.conf: add OPIE_GIT_DIR

Define OPIE_GIT_DIR (in OE-dev this was in bitbake.conf)

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

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