meta-fsp2: layer.conf: change BBFILE_PATTERN

Use the immmediate expansion operator when setting BBFILE_PATTERN.  This
makes meta-fsp2 consistent with all the layers in meta-openembedded.

(From meta-ibm rev: a44ea07451e667912a6d99d56d4ae61df92b282d)

Change-Id: Ib2d0daaca371b9c2a837b601a257e498d236688c
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-ibm/meta-fsp2/conf/layer.conf b/meta-ibm/meta-fsp2/conf/layer.conf
index 9c0cd0e..e4c64d9 100644
--- a/meta-ibm/meta-fsp2/conf/layer.conf
+++ b/meta-ibm/meta-fsp2/conf/layer.conf
@@ -4,6 +4,6 @@
 BBFILES += "${LAYERDIR}/recipes-*/*/*.bb \
             ${LAYERDIR}/recipes-*/*/*.bbappend"
 
-BBFILE_PATTERN_fsp2-layer = "^${LAYERDIR}"
+BBFILE_PATTERN_fsp2-layer := "^${LAYERDIR}/"
 BBFILE_COLLECTIONS += "fsp2-layer"
 LAYERVERSION_fsp2-layer = "1"