refactor(ff-a): partition info test functions

Move common ffa_partition_info_get functions to the spm_common.
Secure test target now supports both sending and receiving direct
messages.
Changes in SP manifests to align with a new messaging method
representation in partition manifests.

Signed-off-by: Max Shvetsov <maksims.svecovs@arm.com>
Change-Id: I9f6f24d6b800283a07e84a2a27708c0313b68fdc
20 files changed