fix(spm): change error logs to verbose

Helper functions to validate return of FF-A calls or responses
from other endpoints in 'spm_common', were printing ERROR also in cases
where this was actually expected.
Changing those ERROR messages to VERBOSE, given ERROR as referred was
misleading.

Signed-off-by: J-Alves <joao.alves@arm.com>
Change-Id: Id3feac197e8dbff78a616392b5ac7ca914c219df
diff --git a/tftf/tests/runtime_services/secure_service/spm_common.c b/tftf/tests/runtime_services/secure_service/spm_common.c
index 12b70a9..179ef1c 100644
--- a/tftf/tests/runtime_services/secure_service/spm_common.c
+++ b/tftf/tests/runtime_services/secure_service/spm_common.c
@@ -19,7 +19,7 @@
 bool is_ffa_call_error(smc_ret_values ret)
 {
 	if (ffa_func_id(ret) == FFA_ERROR) {
-		ERROR("FF-A call returned error (%x): %d\n",
+		VERBOSE("FF-A call returned error (%x): %d\n",
 		      ffa_func_id(ret), ffa_error_code(ret));
 		return true;
 	}
@@ -38,7 +38,7 @@
 		return true;
 	}
 
-	ERROR("%x is not FF-A response.\n", ffa_func_id(ret));
+	VERBOSE("%x is not FF-A response.\n", ffa_func_id(ret));
 	/* To log error in case it is FFA_ERROR*/
 	is_ffa_call_error(ret);
 
@@ -54,7 +54,7 @@
 		return true;
 	}
 
-	ERROR("Expecting %x, FF-A return was %x\n", func_id, ffa_func_id(ret));
+	VERBOSE("Expecting %x, FF-A return was %x\n", func_id, ffa_func_id(ret));
 
 	return false;
 }