Add topology helper to get parent node

It was not possible to get a parent node given an MPIDR
of the CPU using the current topology APIs. This patch adds
the `tftf_get_parent_node_from_mpidr()` API to achieve the same.

Change-Id: I818f1e628689928293c1fdb85606885e851a5785
Signed-off-by: Soby Mathew <soby.mathew@arm.com>
2 files changed