wspoon: Normalize native fan bbappend search paths

Set FILESEXTRAPATHS to PN for all native recipe appends.

Resolves: openbmc/openbmc#1991

Change-Id: I4f2fc9548dfab5d50970fcfcf1cb6082ae5d9288
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
9 files changed