Add support for Cortex-A57 erratum 828024 workaround

Change-Id: I632a8c5bb517ff89c69268e865be33101059be7d
diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index 3ea462b..7d9f2b7 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -78,6 +78,10 @@
 # only to revision <= r1p1 of the Cortex A57 cpu.
 ERRATA_A57_826974	?=0
 
+# Flag to apply erratum 828024 workaround during reset. This erratum applies
+# only to revision <= r1p1 of the Cortex A57 cpu.
+ERRATA_A57_828024	?=0
+
 # Process ERRATA_A53_826319 flag
 $(eval $(call assert_boolean,ERRATA_A53_826319))
 $(eval $(call add_define,ERRATA_A53_826319))
@@ -97,3 +101,7 @@
 # Process ERRATA_A57_826974 flag
 $(eval $(call assert_boolean,ERRATA_A57_826974))
 $(eval $(call add_define,ERRATA_A57_826974))
+
+# Process ERRATA_A57_828024 flag
+$(eval $(call assert_boolean,ERRATA_A57_828024))
+$(eval $(call add_define,ERRATA_A57_828024))