gptfdisk: remove DEFAULT PREFERENCE
gptfdisk: remove DEFAULT PREFERENCE

The meta-openstack layer no longer provides a competing fdisk
implementation from oe-core. So there is no reason to assert a
preference for OE-core's implementation - remove it.

Signed-off-by: Alex Stewart <04cdb2793e4fb0120cc30d1c823099f3862701f4@ni.com>

ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt