styhead: update WORKDIR usage

The latest yocto release(styhead,5.1) has made a significant change[1]
to the use of the WORKDIR parameter.

This is not the complete change required but gets us going in the right
direction.

[1]: https://docs.yoctoproject.org/next/migration-guides/migration-5.1.html#workdir-changes

Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I4f184b361be69e7704a0657a4a00cdad981aff8a
diff --git a/meta-amd/meta-ethanolx/recipes-phosphor/configuration/ethanolx-yaml-config.bb b/meta-amd/meta-ethanolx/recipes-phosphor/configuration/ethanolx-yaml-config.bb
index c7226ae..5123239 100644
--- a/meta-amd/meta-ethanolx/recipes-phosphor/configuration/ethanolx-yaml-config.bb
+++ b/meta-amd/meta-ethanolx/recipes-phosphor/configuration/ethanolx-yaml-config.bb
@@ -11,7 +11,8 @@
     file://ethanolx-ipmi-sensors.yaml \
     "
 
-S = "${WORKDIR}"
+S = "${WORKDIR}/sources"
+UNPACKDIR = "${S}"
 
 do_install() {
     cat ethanolx-ipmi-fru.yaml > fru-read.yaml