Rename board configuration file

The device tree file is s2600wf.dts, update to match.

Change-Id: Iefcfefd8b6329aa9afb4b831882e2861a0f6a30a
Signed-off-by: James Feist <james.feist@linux.intel.com>
diff --git a/configs/Wfp.py b/configs/S2600wf.py
similarity index 100%
rename from configs/Wfp.py
rename to configs/S2600wf.py