Cortex-A15: Implement workaround for errata 816470

Change-Id: I9755252725be25bfd0147839d7df56888424ff84
Signed-off-by: Ambroise Vincent <ambroise.vincent@arm.com>
diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index 4985dd0..a82db10 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -53,6 +53,10 @@
 # These should be enabled by the platform if the erratum workaround needs to be
 # applied.
 
+# Flag to apply erratum 816470 workaround during power down. This erratum
+# applies only to revision >= r3p0 of the Cortex A15 cpu.
+ERRATA_A15_816470	?=0
+
 # Flag to apply erratum 819472 workaround during reset. This erratum applies
 # only to revision <= r0p1 of the Cortex A53 cpu.
 ERRATA_A53_819472	?=0
@@ -196,6 +200,10 @@
 # higher DSU power consumption on idle.
 ERRATA_DSU_936184	?=0
 
+# Process ERRATA_A15_816470 flag
+$(eval $(call assert_boolean,ERRATA_A15_816470))
+$(eval $(call add_define,ERRATA_A15_816470))
+
 # Process ERRATA_A53_819472 flag
 $(eval $(call assert_boolean,ERRATA_A53_819472))
 $(eval $(call add_define,ERRATA_A53_819472))