vold: Remove creation of new keymaster key for password update

To update user password, VOLD creates a new keymaster key which
would be used in the process to rewrap the FDE key. These already
exists a keymaster blob which contains keymaster key created for
old password. This old keymaster blob is secure and there is no
need to create new keymaster key which can take sometime long time
as well. Hence, removing the need to create a new keymaster key which
does not enhance security but sometimes take longer time to update
user password.

Change-Id: I6ce0f71353d54cb32a11d44731b30fa41df235c8
1 file changed