udev is an optional dependency of bluez5, so use PACKAGECONFIG to give
users the ability to build bluez5 without udev support.
(From OE-Core rev: 862438543ef04a3c23f38ec65cd66a3b4e3907d5)
Signed-off-by: David Frey <dpfrey@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>