busybox: add taskset

This is used by op-test to test stop states, so is useful for
regression testing.

Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
diff --git a/openpower/configs/busybox.fragment b/openpower/configs/busybox.fragment
index 1b13459..bb0cd50 100644
--- a/openpower/configs/busybox.fragment
+++ b/openpower/configs/busybox.fragment
@@ -1 +1,3 @@
 CONFIG_FEATURE_TFTP_PROGRESS_BAR=y
+CONFIG_TASKSET=y
+CONFIG_FEATURE_TASKSET_FANCY=y