treewide: remove gategarth from layer-support

We've typically kept these LAYERSERIES_COMPAT to 2 releases: the current
and the upcoming.  Remove 'gatesgarth' is it is now 2 releases back.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I5e812a94fed1738898af75c0fdee81996a5bbf20
diff --git a/meta-facebook/conf/layer.conf b/meta-facebook/conf/layer.conf
index 895d48f..9e4cf55 100644
--- a/meta-facebook/conf/layer.conf
+++ b/meta-facebook/conf/layer.conf
@@ -7,4 +7,4 @@
 
 BBFILE_COLLECTIONS += "facebook-layer"
 BBFILE_PATTERN_facebook-layer := "^${LAYERDIR}/"
-LAYERSERIES_COMPAT_facebook-layer := "gatesgarth hardknott honister"
+LAYERSERIES_COMPAT_facebook-layer := "hardknott honister"
diff --git a/meta-facebook/meta-bletchley/conf/layer.conf b/meta-facebook/meta-bletchley/conf/layer.conf
index 8e27709..14d3200 100644
--- a/meta-facebook/meta-bletchley/conf/layer.conf
+++ b/meta-facebook/meta-bletchley/conf/layer.conf
@@ -8,4 +8,4 @@
 BBFILE_COLLECTIONS += "bletchley-layer"
 BBFILE_PATTERN_bletchley-layer := "^${LAYERDIR}/"
 
-LAYERSERIES_COMPAT_bletchley-layer := "gatesgarth hardknott honister"
+LAYERSERIES_COMPAT_bletchley-layer := "hardknott honister"
diff --git a/meta-facebook/meta-tiogapass/conf/layer.conf b/meta-facebook/meta-tiogapass/conf/layer.conf
index bb8ecee..af34387 100644
--- a/meta-facebook/meta-tiogapass/conf/layer.conf
+++ b/meta-facebook/meta-tiogapass/conf/layer.conf
@@ -8,4 +8,4 @@
 BBFILE_COLLECTIONS += "tiogapass-layer"
 BBFILE_PATTERN_tiogapass-layer := "^${LAYERDIR}/"
 
-LAYERSERIES_COMPAT_tiogapass-layer := "gatesgarth hardknott honister"
+LAYERSERIES_COMPAT_tiogapass-layer := "hardknott honister"
diff --git a/meta-facebook/meta-yosemitev2/conf/layer.conf b/meta-facebook/meta-yosemitev2/conf/layer.conf
index 091cdc3..654ffab 100644
--- a/meta-facebook/meta-yosemitev2/conf/layer.conf
+++ b/meta-facebook/meta-yosemitev2/conf/layer.conf
@@ -8,4 +8,4 @@
 BBFILE_COLLECTIONS += "yosemitev2-layer"
 BBFILE_PATTERN_yosemitev2-layer := "^${LAYERDIR}/"
 
-LAYERSERIES_COMPAT_yosemitev2-layer := "gatesgarth hardknott honister"
+LAYERSERIES_COMPAT_yosemitev2-layer := "hardknott honister"