osd: Kconfig remove wrong FIXME

The OSD protocol calls for all kind of security levels that use
CRYPTO_HMAC and SH1, but the current code only supports NO_SEC,
which does not use any of these.

Remove a wrong FIXME that calls for them. Thanks Maxin for
reporting on this.

Reported-by: "Maxin B. John" <maxin.john@gmail.com>
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>