We're using the wrong data store when trying to locate siginfo files,
fix this. Thanks to Gregory Lumen <gregorylumen@microsoft.com> for
spotting.
[YOCTO #14774]
(Bitbake rev: 0ed800e19a3197f8e622c8d3b630aae384e60aba)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>