refactor: remove deprecated spm libs and test code

Remove references to former SPCI/SPRT implementation pre-dating now
released FF-A specification.
Remove the sample quark partition image based on those deprecated
specifications.

Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
Change-Id: I5b4e51457307c4ff5befd46132fd26d4ef21cdfa