fix: roll back rdn1edge and sgi575 platforms

rdn1edge and sgi575 are technically working with the new 11.17/33 model
version but only with model parameters that makes the test run very long
(about 40 minutes versus 10). This is too long to include in the daily
run for a single test. Until this problem is solved - rolling back used
model version.
To test locally with 11.17/33 model has to be run the additional
parameters:
--min-sync-latency=0
--quantum=400
And following parameters have to be exported for the run environment:
set_model_env FM_SCX_ENABLE_TIMER_LOCAL_TIME 1
set_model_env FASTSIM_DISABLE_TA 0
set_model_env FASTSIM_AUTO_SYNC 1

Signed-off-by: Maksims Svecovs <maksims.svecovs@arm.com>
Change-Id: I95bb664590c66a423d7c49915db6f70f94ea4577
diff --git a/model/css-sgi575.sh b/model/css-sgi575.sh
index e09c5d7..6681ee5 100644
--- a/model/css-sgi575.sh
+++ b/model/css-sgi575.sh
@@ -5,7 +5,7 @@
 # SPDX-License-Identifier: BSD-3-Clause
 #
 
-set_model_path "$warehouse/SysGen/SubSystemModels/11.17/33/models/$model_flavour/FVP_CSS_SGI-575"
+set_model_path "$warehouse/SysGen/SubSystemModels/11.15/26/models/Linux64_GCC-6.4/FVP_CSS_SGI-575"
 
 cat <<EOF >"$model_param_file"
 -C board.flashloader0.fname=$fip_bin