fix(errata): workaround for Cortex-A510 erratum 2218950

Cortex-A510 erratum 2218950 is a Cat B erratum that applies to revisions
r0p0, r0p1, r0p2, r0p3 and r1p0, and is fixed in r1p1.

SDEN can be found here:
https://developer.arm.com/documentation/SDEN2397239

Signed-off-by: John Powell <john.powell@arm.com>
Change-Id: Icb6e369946f8978a08cf8ed5e4452782efb0a77a
diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index 217e1fb..92193fb 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -552,6 +552,10 @@
 # to revisions r0p0, r0p1, r0p2, r0p3 and r1p0, and is fixed in r1p1.
 ERRATA_A510_2250311	?=0
 
+# Flag to apply erratum 2218950 workaround during reset. This erratum applies
+# to revisions r0p0, r0p1, r0p2, r0p3 and r1p0, and is fixed in r1p1.
+ERRATA_A510_2218950	?=0
+
 # Flag to apply DSU erratum 798953. This erratum applies to DSUs revision r0p0.
 # Applying the workaround results in higher DSU power consumption on idle.
 ERRATA_DSU_798953	?=0
@@ -1029,6 +1033,10 @@
 $(eval $(call assert_boolean,ERRATA_A510_2250311))
 $(eval $(call add_define,ERRATA_A510_2250311))
 
+# Process ERRATA_A510_2218950 flag
+$(eval $(call assert_boolean,ERRATA_A510_2218950))
+$(eval $(call add_define,ERRATA_A510_2218950))
+
 # Process ERRATA_DSU_798953 flag
 $(eval $(call assert_boolean,ERRATA_DSU_798953))
 $(eval $(call add_define,ERRATA_DSU_798953))