Initial values tool

Initial values tool

Add a tool able to create and/or update an initial values xml. It is also
possible to add encrypted ininial values.

Add rpm package for potential use in gbs buildroot during image creation.

Limitations:
- Hardcoded IV & tag length
- Hardcoded Data format

Testing:
dd if=/dev/random of=/tmp/key bs=32 count=1
dd if=/dev/random of=/tmp/data bs=32 count=1
ckm_initial_values -k /tmp/key -d /tmp/data -n name -t Key -s AES -p pass -e
-b hardware -a acc1,acc2,acc3

Change-Id: Id29d0eb58d9dba3e78b3437534cb566046a39877