fix(cpus): update the rev-var for Cortex-A78AE

Update the revision and variant information in the
cortex_a78_ae.s and errata ABI file for erratum ID - 2376748
based on the latest SDEN.

SDEN documentation:
https://developer.arm.com/documentation/SDEN-1707912/latest

Change-Id: I082aac41adf717b0d5d59046a8933a3f5a3de94f
Signed-off-by: Sona Mathew <sonarebecca.mathew@arm.com>
diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index 75f2a77..82212f9 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -352,7 +352,7 @@
 CPU_FLAG_LIST += ERRATA_A78_AE_1951502
 
 # Flag to apply erratum 2376748 workaround during reset. This erratum applies
-# to revisions r0p0 and r0p1 of the A78 AE cpu. It is still open.
+# to revisions r0p0, r0p1 and r0p2 of the A78 AE cpu. It is still open.
 CPU_FLAG_LIST += ERRATA_A78_AE_2376748
 
 # Flag to apply erratum 2395408 workaround during reset. This erratum applies