Use # format specifier rather than manually writing 0x for hex numbers.

Change-Id: Ic3f98b33b34ce5ffe3300a5ca9c9c309ef2c056c
diff --git a/src/arch/aarch64/hypervisor/psci_handler.c b/src/arch/aarch64/hypervisor/psci_handler.c
index b98dd22..5f5f211 100644
--- a/src/arch/aarch64/hypervisor/psci_handler.c
+++ b/src/arch/aarch64/hypervisor/psci_handler.c
@@ -45,12 +45,12 @@
 	case PSCI_VERSION_1_0:
 	case PSCI_VERSION_1_1:
 		/* Supported EL3 PSCI version. */
-		dlog("Found PSCI version: 0x%x\n", el3_psci_version);
+		dlog("Found PSCI version: %#x\n", el3_psci_version);
 		break;
 
 	default:
 		/* Unsupported EL3 PSCI version. Log a warning but continue. */
-		dlog("Warning: unknown PSCI version: 0x%x\n", el3_psci_version);
+		dlog("Warning: unknown PSCI version: %#x\n", el3_psci_version);
 		el3_psci_version = 0;
 		break;
 	}