crypto: tool: getstat: convert user space example to the new crypto_user_stat uapi

This patch converts the getstat example tool to the recent changes done in crypto_user_stat
- changed all stats to u64
- separated struct stats for each crypto alg

Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>