Tegra: Control inclusion of helper code used for asserts

One assert depends on code that is conditionally compiled based on the
DEBUG define. This patch modifies the conditional inclusion of such code
so that it is based on the ENABLE_ASSERTIONS build option.

Change-Id: Ic5659a3db8632593b9d2e83dac6d30afd87c131d
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>

plat/nvidia/tegra/soc/t132/plat_psci_handlers.c

 /*
- * Copyright (c) 2015-2016, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -132,7 +132,7 @@ int tegra_soc_pwr_domain_off(const psci_power_state_t *target_state)
 
 int tegra_soc_pwr_domain_suspend(const psci_power_state_t *target_state)
 {
-#if DEBUG
+#if ENABLE_ASSERTIONS
 	int cpu = read_mpidr() & MPIDR_CPU_MASK;
 
 	/* SYSTEM_SUSPEND only on CPU0 */