vpnor: Rename mboxd_pnor_partition_table sources to backend

Change-Id: I6f0fff4ab54e011c1765fc04186e899754787641
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/mboxd.h b/mboxd.h
index ef4f5be..96235d7 100644
--- a/mboxd.h
+++ b/mboxd.h
@@ -13,7 +13,7 @@
 #include "backend.h"
 #include "protocol.h"
 #include "transport.h"
-#include "vpnor/mboxd_pnor_partition_table.h"
+#include "vpnor/backend.h"
 #include "windows.h"
 
 enum api_version {