witherspoon-tacoma: do not install ikvm

witherspoon-tacoma systems do not utilize this feature

Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
Change-Id: I112ae5e11b20b42c1d23e35b39a366bbe323d476
diff --git a/conf/machine/witherspoon-tacoma.conf b/conf/machine/witherspoon-tacoma.conf
index bd8d711..572484f 100644
--- a/conf/machine/witherspoon-tacoma.conf
+++ b/conf/machine/witherspoon-tacoma.conf
@@ -34,3 +34,5 @@
 # last partition (hostfw) was made configurable. The default size of the hostfw
 # partition is 5GB, therefore setting it to 4GB for Tacoma.
 WKS_HOSTFW_SIZE = "4G"
+
+IMAGE_FEATURES_remove = "obmc-ikvm"