fix: don't increase SRAM for `fvp-errata-abi-a710`

The model used for tests with this TF-A configuration is pinned to 11.17
and does not support the 512KB Trusted SRAM option.

Change-Id: I6a24913a3f490dc78b0aa628ee8025da4a7fb24d
Signed-off-by: Chris Kay <chris.kay@arm.com>
diff --git a/tf_config/fvp-errata-abi-a710 b/tf_config/fvp-errata-abi-a710
index 5b7f5b7..43b6ebb 100644
--- a/tf_config/fvp-errata-abi-a710
+++ b/tf_config/fvp-errata-abi-a710
@@ -10,7 +10,6 @@
 ERRATA_A710_2768515=1
 ERRATA_ABI_SUPPORT=1
 ERRATA_NON_ARM_INTERCONNECT=1
-FVP_TRUSTED_SRAM_SIZE=384
 HW_ASSISTED_COHERENCY=1
 PLAT=fvp
 USE_COHERENT_MEM=0