Bump version to v1.6.1

A number of fixes have accumulated, so rolling up another release.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
diff --git a/Makefile b/Makefile
index c187d5f..ea8c659 100644
--- a/Makefile
+++ b/Makefile
@@ -11,7 +11,7 @@
 #
 VERSION = 1
 PATCHLEVEL = 6
-SUBLEVEL = 0
+SUBLEVEL = 1
 EXTRAVERSION =
 LOCAL_VERSION =
 CONFIG_LOCALVERSION =