fix(zynqmp): enable A53 workaround(errata 1530924)

BL31 already reports that there is missing CPU workaround for this
erratum as
"WARNING: BL31: cortex_a53: CPU workaround for 1530924 was missing!"

That's why enable it by default as was done by other platforms for
example by commit 74665119f04d ("allwinner: Enable workaround for
Cortex-A53 erratum 1530924").

Change-Id: I251ffe3c307781b07477afb64f4e7af5dd9af9fe
Signed-off-by: Michal Simek <michal.simek@amd.com>
(cherry picked from commit d8133d7785969b417cbace293db6393c55844fac)

plat/xilinx/zynqmp/platform.mk

@@ -5,6 +5,7 @@
 # SPDX-License-Identifier: BSD-3-Clause
 
 override ERRATA_A53_855873 := 1
+ERRATA_A53_1530924 := 1
 override PROGRAMMABLE_RESET_ADDRESS := 1
 PSCI_EXTENDED_STATE_ID := 1
 A53_DISABLE_NON_TEMPORAL_HINT := 0