Fix phosphor-ipmi-host to permit "devtool modify" to succeed

The change that removed entity.yaml from the autogeneration method
also broke using devtool modify. Devtool fails to copy entity.yaml to
its destination directory because it can't be found in the Yocto
source directories.

Change-Id: Id29363c00585b5c4ea0e67f8bb146447ef1f9cd6
Signed-off-by: Johnathan Mantey <johnathanx.mantey@intel.com>
diff --git a/recipes-phosphor/ipmi/phosphor-ipmi-host_git.bb b/recipes-phosphor/ipmi/phosphor-ipmi-host_git.bb
index f5606cb..1df091f 100644
--- a/recipes-phosphor/ipmi/phosphor-ipmi-host_git.bb
+++ b/recipes-phosphor/ipmi/phosphor-ipmi-host_git.bb
@@ -106,7 +106,7 @@
 do_replace_entity_default() {
     # The in-repo provided default is tailored to testing the ipmid code.
     # Replace it with a reasonable default for users.
-    cp entity.yaml ${S}/scripts/entity-example.yaml
+    cp ${THISDIR}/${PN}/entity.yaml ${S}/scripts/entity-example.yaml
 }
 
 do_patch_append() {