meta-facebook: move virtual sensor config json into platform layers

Description:
Most platforms need some sort of phosphor-virtual-sensor config, but some
install multiple.  Modify the common bbappend so it can be reused and
with a minimal bbappend most platforms can add their own config in the
platform layer.

Tested:
Build service on changed platforms- pass

Change-Id: I77f4be1519325c0ebb00d0dc9a2f4e104601f62b
Signed-off-by: Delphine CC Chiu <Delphine_CC_Chiu@wiwynn.com>
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/meta-facebook/meta-greatlakes/recipes-phosphor/sensors/phosphor-virtual-sensor_%.bbappend b/meta-facebook/meta-greatlakes/recipes-phosphor/sensors/phosphor-virtual-sensor_%.bbappend
new file mode 100644
index 0000000..4fc41d0
--- /dev/null
+++ b/meta-facebook/meta-greatlakes/recipes-phosphor/sensors/phosphor-virtual-sensor_%.bbappend
@@ -0,0 +1 @@
+FILESEXTRAPATHS:prepend := "${THISDIR}/${PN}:"