netboot: Add a callback for finding netboot parameter storage.

This will allow having the parameters somewhere other than flash, and
disassociates the parameters and the nv scratch space.

Change-Id: Ie567580e4ee16382caa5be16deb1fe18152ea2d7
diff --git a/src/netboot/params.h b/src/netboot/params.h
index 0cc15fc..26d387b 100644
--- a/src/netboot/params.h
+++ b/src/netboot/params.h
@@ -25,6 +25,7 @@
 
 #include <stdint.h>
 
+#include "drivers/storage/storage.h"
 #include "net/uip.h"
 
 typedef enum NetbootParamId
@@ -48,4 +49,7 @@
 			size_t cmd_line_max, char **bootfile, char **argsfile);
 NetbootParam *netboot_params_val(NetbootParamId paramId);
 
+
+StorageOps *netboot_params_storage(void);
+
 #endif /* __NETBOOT_PARAMS_H__ */