vpnor: Rename mboxd_pnor_partition_table sources to backend

Change-Id: I6f0fff4ab54e011c1765fc04186e899754787641
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/vpnor/test/create_read_window_oob.cpp b/vpnor/test/create_read_window_oob.cpp
index d1e7e64..8652d72 100644
--- a/vpnor/test/create_read_window_oob.cpp
+++ b/vpnor/test/create_read_window_oob.cpp
@@ -13,7 +13,7 @@
 #include <cassert>
 #include <cstring>
 
-#include "vpnor/mboxd_pnor_partition_table.h"
+#include "vpnor/backend.h"
 
 const std::string toc[] = {
     "partition01=HBB,00001000,00002000,80,ECC,READONLY",