Temporarily blacklist falco binhosts

The falco PFQ is temporarily unusable due to the freon transition.

BUG=chromium:454515
TEST=ran setup_board --board falco
CQ-DEPEND=CL:245592

Change-Id: Ia59f64f655892646894d6028551f292d555a9280
Reviewed-on: https://chromium-review.googlesource.com/252263
Reviewed-by: David James <davidjames@chromium.org>
Tested-by: Michael Spang <spang@chromium.org>
Commit-Queue: Michael Spang <spang@chromium.org>
Trybot-Ready: Michael Spang <spang@chromium.org>
(cherry picked from commit db464c2ce15006ba11a358d505ef40e11e2df748)
Reviewed-on: https://chromium-review.googlesource.com/255914
Reviewed-by: Michael Spang <spang@chromium.org>
diff --git a/setup_board b/setup_board
index a2f4655..4e14d3c 100755
--- a/setup_board
+++ b/setup_board
@@ -246,6 +246,10 @@
     ['x86']='x86-alex'
     ['arm']='daisy_skate'
   )
+  declare -A chrome_blacklist
+  chrome_blacklist=(
+    ['falco']=yes
+  )
   if has chrome_internal $(portageq-${BOARD_VARIANT} envvar USE); then
     chrome_binhost_base=${internal_binhost_dir}
   else
@@ -278,6 +282,9 @@
   local board chrome_binhost internal_binhost preflight_binhost
   for board in ${BOARD_VARIANT} ${i_chrome} ${e_chrome} \
                ${BOARD} ${i_generic} ${e_generic}; do
+    if [[ -n "${chrome_blacklist[${board}]}" ]]; then
+      continue
+    fi
     if [[ -z ${chrome_binhost} || ! -f ${chrome_binhost} ||
           -z $(source "${chrome_binhost}";
                echo -n ${LATEST_RELEASE_CHROME_BINHOST}) ]]; then