Chris Coulson 5e7f94a23f shared/tpm2: split the tpm2_index_to_handle helper function
The existing tpm2_index_to_handle helper has optional return arguments
for an object's public area and its qualified name. However, it can also
be called for handles corresponding to NV indexes, where the public area
and qualified name don't apply.

I'm working on another change that would benefit from having an
equivalent helper for NV indexes, and there is already some code in
shared/tpm2-util.c that could use this as well.

This splits the existing tpm2_index_to_handle function into 3 functions:
- tpm2_index_to_handle, which works for both objects and NV indexes and
  returns a name and handle.
- tpm2_object_index_to_handle, which works the same as the existing
  function for transient or persistent objects, returning a public area,
  name, qualified name and handle.
- tpm2_nv_index_to_handle, which works for NV indexes, returning the NV
  public area, name and handle.
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