Interface: Introduce psa_call() type range

The range of parameter 'type' for psa_call() was applied long
time ago, but the spec required preprocessor is not defined.

Introduce the definition and updated the relevant code.

Signed-off-by: Ken Liu <Ken.Liu@arm.com>
Change-Id: I9ecc842bcdb3b1b564e8d9fb6fccefd7952fb420
diff --git a/interface/include/psa/client.h b/interface/include/psa/client.h
index 7aee1e5..b4e8b09 100644
--- a/interface/include/psa/client.h
+++ b/interface/include/psa/client.h
@@ -58,6 +58,15 @@
  */
 #define PSA_MAX_IOVEC               (4u)
 
+
+/**
+ * The minimum and maximum value in THIS implementation that can be passed
+ * as the type parameter in a call to psa_call().
+ */
+
+#define PSA_CALL_TYPE_MIN           (0)
+#define PSA_CALL_TYPE_MAX           (INT16_MAX)
+
 /**
  * An IPC message type that indicates a generic client request.
  */
diff --git a/interface/src/tfm_psa_call.c b/interface/src/tfm_psa_call.c
index 62d9ad2..b25ccdd 100644
--- a/interface/src/tfm_psa_call.c
+++ b/interface/src/tfm_psa_call.c
@@ -16,10 +16,10 @@
                       psa_outvec *out_vec,
                       size_t out_len)
 {
-    if ((type > INT16_MAX) ||
-        (type < INT16_MIN) ||
-        (in_len > UINT8_MAX) ||
-        (out_len > UINT8_MAX)) {
+    if ((type    > PSA_CALL_TYPE_MAX) ||
+        (type    < PSA_CALL_TYPE_MIN) ||
+        (in_len  > PSA_MAX_IOVEC)     ||
+        (out_len > PSA_MAX_IOVEC)) {
         return PSA_ERROR_PROGRAMMER_ERROR;
     }
 
diff --git a/interface/src/tfm_psa_ns_api.c b/interface/src/tfm_psa_ns_api.c
index c10baa6..819c72b 100644
--- a/interface/src/tfm_psa_ns_api.c
+++ b/interface/src/tfm_psa_ns_api.c
@@ -38,10 +38,10 @@
                       psa_outvec *out_vec,
                       size_t out_len)
 {
-    if ((type > INT16_MAX) ||
-        (type < INT16_MIN) ||
-        (in_len > UINT8_MAX) ||
-        (out_len > UINT8_MAX)) {
+    if ((type    > PSA_CALL_TYPE_MAX) ||
+        (type    < PSA_CALL_TYPE_MIN) ||
+        (in_len  > PSA_MAX_IOVEC)     ||
+        (out_len > PSA_MAX_IOVEC)) {
         return PSA_ERROR_PROGRAMMER_ERROR;
     }