Support different log levels.

This will let us add more verbose logs for debugging but have them
compiled out most of the time.

Change-Id: Iaae468e41025a165b5e67fa6fec5422f004c6a44
diff --git a/src/arch/aarch64/hypervisor/psci_handler.c b/src/arch/aarch64/hypervisor/psci_handler.c
index 1d638e4..147f9eb 100644
--- a/src/arch/aarch64/hypervisor/psci_handler.c
+++ b/src/arch/aarch64/hypervisor/psci_handler.c
@@ -48,12 +48,12 @@
 	case PSCI_VERSION_1_0:
 	case PSCI_VERSION_1_1:
 		/* Supported EL3 PSCI version. */
-		dlog("Found PSCI version: %#x\n", el3_psci_version);
+		dlog_info("Found PSCI version: %#x\n", el3_psci_version);
 		break;
 
 	default:
 		/* Unsupported EL3 PSCI version. Log a warning but continue. */
-		dlog("Warning: unknown PSCI version: %#x\n", el3_psci_version);
+		dlog_warning("Unknown PSCI version: %#x\n", el3_psci_version);
 		el3_psci_version = 0;
 		break;
 	}