Disable verification for now & add memcmp32sparse

When the commit with the configuration will be a available, these 3 options will exist:

- Disable verification
- Sparse verification (Fast)
- Full (Slow)

Sparse will take approx 8 minutes for rawnand.bin and Full will take 4.5 hours.

ipl/util.h

@@ -34,4 +34,8 @@ void sleep(u32 ticks);
 void exec_cfg(u32 *base, const cfg_op_t *ops, u32 num_ops);
 u32 crc32c(const void *buf, u32 len);
 
+/* This is a faster implementation of memcmp that checks two u32 values */
+/* every 128 Bytes block. Intented for only for Backup and Restore      */
+u32 memcmp32sparse(const u32 *buf1, const u32 *buf2, u32 len);
+
 #endif