basys3.sh: use proper script to setup environment

Signed-off-by: John McMaster <johndmcmaster@gmail.com>

minitests/roi_harness/basys3.sh

diff --git a/minitests/roi_harness/basys3.sh b/minitests/roi_harness/basys3.sh
index 00fed67..d2fd303 100644
--- a/minitests/roi_harness/basys3.sh
+++ b/minitests/roi_harness/basys3.sh
@@ -11,4 +11,4 @@
 export XRAY_PIN_05="V15"
 export XRAY_PIN_06="W14"
 
-export XRAY_BITREAD="$XRAY_DIR/build/tools/bitread -part_file $XRAY_DIR/database/artix7/xc7a35tcpg236-1.yaml"
+source $XRAY_DIR/utils/environment.sh