fs.mitm: Intercept OpenBisStorage calls.

stratosphere/fs_mitm/source/fs_shim.h

@@ -17,6 +17,7 @@ typedef struct {
 } FsRangeInfo;
 
 /* Missing fsp-srv commands. */
+Result fsOpenBisStorageFwd(Service* s, FsStorage* out, u32 PartitionId);
 Result fsOpenDataStorageByCurrentProcessFwd(Service* s, FsStorage* out);
 Result fsOpenDataStorageByDataIdFwd(Service* s, FsStorageId storage_id, u64 data_id, FsStorage* out);