Fixes [YOCTO #4497]
Usage of FILESPATH is discouraged, since it can make recipes harder to
bbappend. Instead FILESEXTRAPATHS should be used to extend the path.
Also remove unused filespath addition.
(From OE-Core rev: de37e4d7f995a0032d016c621c35ef1f79daa8ae)
Signed-off-by: Petter Mabäcker <petter@technux.se>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>