update_gpu_drivers: Update setup_board usage.

BUG=chromium:893748
TEST=precq
CQ-DEPEND=CL:1409763

Change-Id: I983fa6a5fd9d9b64afc645bacab21ad1f46e8ec0
Reviewed-on: https://chromium-review.googlesource.com/1407424
Commit-Ready: Alex Klein <saklein@chromium.org>
Tested-by: Alex Klein <saklein@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
diff --git a/contrib/update_gpu_drivers.sh b/contrib/update_gpu_drivers.sh
index 1b34345..6e0c004 100755
--- a/contrib/update_gpu_drivers.sh
+++ b/contrib/update_gpu_drivers.sh
@@ -164,7 +164,7 @@
     pvr="${pvr##*${pn}-}"
   else
     # Build from source.
-    "${SRC_ROOT}/scripts/setup_board" --board="${board}"
+    setup_board --board="${board}"
     if [[ $? != 0 ]]; then
       die "Setting up board ${board} failed."
     fi