contrib: Migrate to cros workon

cros_workon is now deprecated. Use 'cros workon' instead.

BUG=none
TEST=Run dry run.

Change-Id: Ib6f4ac4204af7dd6e91a5b691e8e3088fb5a6412
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/2341182
Tested-by: Andrew McRae <amcrae@chromium.org>
Auto-Submit: Andrew McRae <amcrae@chromium.org>
Commit-Queue: Andrew McRae <amcrae@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
diff --git a/contrib/update_program_fw b/contrib/update_program_fw
index f57c1f8..ff9edfd 100755
--- a/contrib/update_program_fw
+++ b/contrib/update_program_fw
@@ -88,8 +88,8 @@
       gerrit -i abandon "${cl}"
     done
   fi
-  "cros-workon-${FLAGS_board}" stop "chromeos-base/chromeos-firmware-${FLAGS_board}"
-  "cros-workon-${FLAGS_board}" stop "chromeos-base/chromeos-config-bsp-${FLAGS_board}-private"
+  cros workon "--board=${FLAGS_board}" stop "chromeos-base/chromeos-firmware-${FLAGS_board}"
+  cros workon "--board=${FLAGS_board}" stop "chromeos-base/chromeos-config-bsp-${FLAGS_board}-private"
   repo abandon "${BRANCH}"
   die "$*"
 }
@@ -550,8 +550,8 @@
 #
 # Remove any previous attempts to build the firmware.
 #
-"cros-workon-${FLAGS_board}" stop "chromeos-base/chromeos-firmware-${FLAGS_board}"
-"cros-workon-${FLAGS_board}" stop "chromeos-base/chromeos-config-bsp-${FLAGS_board}-private"
+cros workon "--board=${FLAGS_board}" stop "chromeos-base/chromeos-firmware-${FLAGS_board}"
+cros workon "--board=${FLAGS_board}" stop "chromeos-base/chromeos-config-bsp-${FLAGS_board}-private"
 cd "${OVERLAY}"
 branch
 cd "${DEVCONTRIB}"