refactor(tc): Make tc0 tftf code generic to tc.

This code can be used for tc0, tc1 and tc2 testing so change from
tc0 naming to tc.

Signed-off-by: Daniel Boulby <daniel.boulby@arm.com>
Change-Id: Ied011db0cd688936d6ba20e48c5206de4891e732
diff --git a/plat/arm/tc/tc_pwr_state.c b/plat/arm/tc/tc_pwr_state.c
new file mode 100644
index 0000000..46d952b
--- /dev/null
+++ b/plat/arm/tc/tc_pwr_state.c
@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2020, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <platform.h>
+#include <psci.h>
+
+/* State IDs for local power states on SGI platforms. */
+#define TC_PS_RUN_STATE_ID		0 /* Valid for CPUs and Clusters */
+#define TC_PS_RETENTION_STATE_ID	1 /* Valid for only CPUs */
+#define TC_PS_OFF_STATE_ID		2 /* Valid for CPUs and Clusters */
+
+/* Suspend depth definitions for each power state */
+#define TC_PS_RUN_DEPTH		0
+#define TC_PS_RETENTION_DEPTH		1
+#define TC_PS_OFF_DEPTH		2
+
+/* The state property array with details of idle state possible for the core */
+static const plat_state_prop_t core_state_prop[] = {
+	{TC_PS_RETENTION_DEPTH, TC_PS_RETENTION_STATE_ID,
+		PSTATE_TYPE_STANDBY},
+	{TC_PS_OFF_DEPTH, TC_PS_OFF_STATE_ID, PSTATE_TYPE_POWERDOWN},
+	{0}
+};
+
+/* The state property array with details of idle state possible for the cluster */
+static const plat_state_prop_t cluster_state_prop[] = {
+	{TC_PS_OFF_DEPTH, TC_PS_OFF_STATE_ID, PSTATE_TYPE_POWERDOWN},
+	{0}
+};
+
+const plat_state_prop_t *plat_get_state_prop(unsigned int level)
+{
+	switch (level) {
+	case MPIDR_AFFLVL0:
+		return core_state_prop;
+	case MPIDR_AFFLVL1:
+		return cluster_state_prop;
+	default:
+		return NULL;
+	}
+}