fix: reduce verbosity on passing tf-a-tests

Reduce error messages verbosity for negative tests:

> Executing 'FF-A RXTX unmap SP rxtx buffer'
ERROR: The Hypervisor must specify a valid VM ID in register W1, if FFA_RXTX_UNMAP call forwarded to SPM.
  TEST COMPLETE                                                 Passed

> Executing 'Bigger FFA version than SPM'
ERROR: Version 20000 incompatible with 10002
  TEST COMPLETE                                                 Passed

Reduce warning message verbosity for RME test cases:

> Executing 'Hypervisor lend + memory retrieve request'
WARNING: arch_memory_protect: memory protect services rely on RME feature. Memory is not protected 8899d000
  TEST COMPLETE                                                 Passed

Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
Change-Id: I439bc172812aecf4599ffa704d25e1a09c05f1ea
diff --git a/src/api.c b/src/api.c
index 762b6bb..edbc73d 100644
--- a/src/api.c
+++ b/src/api.c
@@ -1828,7 +1828,7 @@
 	struct ffa_value ret = (struct ffa_value){.func = FFA_SUCCESS_32};
 
 	if (vm->id == HF_HYPERVISOR_VM_ID && !ffa_is_vm_id(allocator_id)) {
-		dlog_error(
+		dlog_verbose(
 			"The Hypervisor must specify a valid VM ID in register "
 			"W1, if FFA_RXTX_UNMAP call forwarded to SPM.\n");
 		return ffa_error(FFA_INVALID_PARAMETERS);
@@ -2391,8 +2391,8 @@
 	if ((requested_version >> FFA_VERSION_MAJOR_OFFSET) !=
 		    FFA_VERSION_MAJOR ||
 	    requested_version > FFA_VERSION_COMPILED) {
-		dlog_error("Version %x incompatible with %x\n",
-			   requested_version, FFA_VERSION_COMPILED);
+		dlog_verbose("Version %x incompatible with %x\n",
+			     requested_version, FFA_VERSION_COMPILED);
 		return (struct ffa_value){.func = (uint32_t)FFA_NOT_SUPPORTED};
 	}