feat(amd): add test for operating characteristics EEMI API

Add test for the get_op_characteristics API within the TF-A test
framework. The purpose of this test is to request the power
management controller to return information about an operating
characteristic of a component.

Change-Id: I3b8346a82742c1b59dacc724c29235e4dbd6e753
Signed-off-by: Madhav Bhatt <madhav.bhatt@amd.com>
6 files changed