Per-cpu data cache restructuring

This patch prepares the per-cpu pointer cache for wider use by:
* renaming the structure to cpu_data and placing in new header
* providing accessors for this CPU, or other CPUs
* splitting the initialization of the TPIDR pointer from the
  initialization of the cpu_data content
* moving the crash stack initialization to a crash stack function
* setting the TPIDR pointer very early during boot

Change-Id: Icef9004ff88f8eb241d48c14be3158087d7e49a3
diff --git a/services/std_svc/psci/psci_entry.S b/services/std_svc/psci/psci_entry.S
index bc8d900..037673d 100644
--- a/services/std_svc/psci/psci_entry.S
+++ b/services/std_svc/psci/psci_entry.S
@@ -61,6 +61,12 @@
 	adr	x22, psci_afflvl_power_on_finish
 
 	/* ---------------------------------------------
+	 * Initialise the pcpu cache pointer for the CPU
+	 * ---------------------------------------------
+	 */
+	bl	init_cpu_data_ptr
+
+	/* ---------------------------------------------
 	 * Exceptions should not occur at this point.
 	 * Set VBAR in order to handle and report any
 	 * that do occur