LZO support is optional so add a PACKAGECONFIG to control this.
Also clean up the xattr PACKAGECONFIG to explicitly enable/disable.
(From OE-Core rev: 69a4dd839b0659c1a04728cf2edd744bd20c012a)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>