test: increase FVP Trusted SRAM where necessary

The TF-A configurations used by some tests require a larger Trusted SRAM
than the 256KB default. This increases the Trusted SRAM of these tests
to 384KB.

Signed-off-by: Chris Kay <chris.kay@arm.com>
Change-Id: If9a09d32472d8db78bd375da343a8feca6f82044
diff --git a/tf_config/fvp-drtm-romlib b/tf_config/fvp-drtm-romlib
index 2fcb7c2..6abce14 100644
--- a/tf_config/fvp-drtm-romlib
+++ b/tf_config/fvp-drtm-romlib
@@ -2,3 +2,4 @@
 DRTM_SUPPORT=1
 PLAT=fvp
 USE_ROMLIB=1
+FVP_TRUSTED_SRAM_SIZE=384