Auto-fetch memory module when set_env runs

set_env.sh

 export SOCLABS_AHB_QSPI_DIR=$(pwd)
-export SOCLABS_SOCTOOLS_FLOW_DIR=$SOCLABS_AHB_QSPI_DIR/soctools_flow
\ No newline at end of file
+export SOCLABS_SOCTOOLS_FLOW_DIR=$SOCLABS_AHB_QSPI_DIR/soctools_flow
+
+if [ ! -f ./verif/VIP/SST26VF064B.v ]; then
+    make get_flash_model
+fi
\ No newline at end of file