chore: update status of Cortex-X3 erratum 2615812

SDEN documentation:
https://developer.arm.com/documentation/2055130/latest

Change-Id: Ied7150bab505a743401cf4afa9a0a5f81d5fdff1
Signed-off-by: Sona Mathew <sonarebecca.mathew@arm.com>
diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index f5997ae..806992d 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -795,7 +795,7 @@
 CPU_FLAG_LIST += ERRATA_X3_2372204
 
 # Flag to apply erratum 2615812 workaround on powerdown. This erratum applies
-# to revisions r0p0, r1p0, r1p1 of the Cortex-X3 cpu, it is still open.
+# to revisions r0p0, r1p0, r1p1 of the Cortex-X3 cpu, it is fixed in r1p2.
 CPU_FLAG_LIST += ERRATA_X3_2615812
 
 # Flag to apply erratum 2641945 workaround on reset. This erratum applies