build-setup: prepare for meta-ibm restructuring

ibm is moving most of its machine targets from meta-witherspoon to the
more aptly named meta-ibm.  Prepare for that by adjusting LAYER_DIR for
ibm targets.

Change-Id: Ib583fe61b3fd30cf179634ad2713c451376c29cc
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/build-setup.sh b/build-setup.sh
index 3145ac1..0f3151d 100755
--- a/build-setup.sh
+++ b/build-setup.sh
@@ -133,32 +133,32 @@
     DISTRO="openbmc-openpower"
     ;;
   swift)
-    LAYER_DIR="meta-ibm/meta-witherspoon"
+    LAYER_DIR="meta-ibm"
     MACHINE="swift"
     DISTRO="openbmc-witherspoon"
     ;;
   mihawk)
-    LAYER_DIR="meta-ibm/meta-witherspoon"
+    LAYER_DIR="meta-ibm"
     MACHINE="mihawk"
     DISTRO="openbmc-witherspoon"
     ;;
   witherspoon)
-    LAYER_DIR="meta-ibm/meta-witherspoon"
+    LAYER_DIR="meta-ibm"
     MACHINE="witherspoon"
     DISTRO="openbmc-witherspoon"
     ;;
   witherspoon-128)
-    LAYER_DIR="meta-ibm/meta-witherspoon"
+    LAYER_DIR="meta-ibm"
     MACHINE="witherspoon-128"
     DISTRO="openbmc-witherspoon"
     ;;
   witherspoon-tacoma)
-    LAYER_DIR="meta-ibm/meta-witherspoon"
+    LAYER_DIR="meta-ibm"
     MACHINE="witherspoon-tacoma"
     DISTRO="openbmc-openpower"
     ;;
   rainier)
-    LAYER_DIR="meta-ibm/meta-witherspoon"
+    LAYER_DIR="meta-ibm"
     MACHINE="rainier"
     DISTRO="openbmc-openpower"
     ;;