versions.json: bump version to 2.7.1

Set version to 2.7.1 as we start merging bugfixes.

Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>

Author: kv2019i

versions.json

@@ -2,6 +2,6 @@
   "SOF": {
     "MAJOR": "2",
     "MINOR": "7",
-    "MICRO": "0"
+    "MICRO": "1"
   }
 }