rauc: do not use git recipe by default
rauc: do not use git recipe by default

Setting DEFAULT_PREFERENCE = "-1" will prevent from using the
(development) git recipes instead of the (stable) release recipes by
default.
Otherwise the default recipe would always be bypassed because the git
recipes have a higher version number.

Signed-off-by: Enrico Joerns <a2e5f936c390f36494e46e71bcfbe365bb1e8c49@pengutronix.de>

rauc/meta-rauc,rauc/meta-rauc,rauc/meta-rauc,rauc/meta-rauc