fix(cpus): workaround for Cortex-A710 erratum 2742423

Cortex-A710 erratum 2742423 is a Cat B erratum that applies to all
revisions <= r2p1 and is still open. The workaround is to set
CPUACTLR5_EL1[56:55] to 2'b01.

SDEN documentation:
https://developer.arm.com/documentation/SDEN-1775101/latest

Change-Id: I4d9d3760491f1e6c59b2667c16d59b99cc7979f1
Signed-off-by: Bipin Ravi <bipin.ravi@arm.com>
diff --git a/services/std_svc/errata_abi/errata_abi_main.c b/services/std_svc/errata_abi/errata_abi_main.c
index f2ca0d1..108b8ff 100644
--- a/services/std_svc/errata_abi/errata_abi_main.c
+++ b/services/std_svc/errata_abi/errata_abi_main.c
@@ -328,8 +328,9 @@
 		[13] = {2371105, 0x00, 0x20, ERRATA_A710_2371105},
 		[14] = {2701952, 0x00, 0x21, ERRATA_A710_2701952, \
 			ERRATA_NON_ARM_INTERCONNECT},
-		[15] = {2768515, 0x00, 0x21, ERRATA_A710_2768515},
-		[16 ... ERRATA_LIST_END] = UNDEF_ERRATA,
+		[15] = {2742423, 0x00, 0x21, ERRATA_A710_2742423},
+		[16] = {2768515, 0x00, 0x21, ERRATA_A710_2768515},
+		[17 ... ERRATA_LIST_END] = UNDEF_ERRATA,
 	}
 },
 #endif /* CORTEX_A710_H_INC */