rakp12: Clear security sensitive data

As password is sensitive data Clear after use.

Tested:
Verified using ipmitool command
Command: ipmitool -I lanplus -C 17 -p 623 -U root -P <password> -H
         <BMC-IP> user list 1
Response: Displayed user list successfully.

Signed-off-by: Jayaprakash Mutyala <mutyalax.jayaprakash@intel.com>
Change-Id: I662572855fcdc083009a5217042b1018990be9b8
1 file changed