Interface: Split PSA NS APIs for connection based services only

This patch splits PSA NS APIs which are only for connection based
services into a single file.

CONFIG_TFM_CONNECTION_BASED_SERVICE_API is also defined in CMake so that
tfm_psa_ns_connection_api.c will be compiled and installed only when
connection based service exists.

Signed-off-by: Xinyu Zhang <xinyu.zhang@arm.com>
Change-Id: I4656e71d762b4524f113ff8830f072848c651493
4 files changed