RPC: Merge RPC PSA Client APIs

Originally, connection-based APIs are optional, depends on whether the
TF-M provides any.
So the RPC APIs are also separated so that they can be selected.

Later, the APIs are always provided with returning NOT SUPPORTED in case
of no connection-based APIs.
And the RPC test framework followed up by always building all the APIs.

This patch makes it further by merging all the APIs.

Change-Id: I923c24e5e83cae4e3d8f4774d776dbe8d07610c2
Signed-off-by: Kevin Peng <kevin.peng@arm.com>
diff --git a/erpc/client/erpc_client_wrapper.c b/erpc/client/erpc_client_wrapper.c
index 37b5f82..4b23f5f 100644
--- a/erpc/client/erpc_client_wrapper.c
+++ b/erpc/client/erpc_client_wrapper.c
@@ -7,7 +7,7 @@
 
 #include <stddef.h>
 #include "psa/client.h"
-#include "tfm_erpc_psa_client_api.h"
+#include "tfm_erpc.h"
 
 psa_status_t psa_call(psa_handle_t handle, int32_t type,
                       const psa_invec *in_vec, size_t in_len,