Core: Distinguish connection handle types

SPM function direct accesses internal handle type instance,
and expose 'psa_handle_t' to external. Distinguish the internal
and the external connection handle types.
Remove 'tfm_spm_get_service_by_handle' function since we can
directly get service with connection handle.
Remove 'tfm_spm_find_conn_handle_node' function.

Change-Id: I60b481e409f4165ec1bbde97c498ee17d74c5a29
Signed-off-by: Summer Qin <summer.qin@arm.com>
4 files changed