util/board_status: Switch branch to main for uploading results

The default branch for the board-status repo was renamed to main, and
thus the -u option for board_status.sh no longer works as it tries to
push to master. Update the branch accordingly.

TEST: board_status.sh is able to upload results to review.coreboot.org
using the -u flag.

Change-Id: Ic90e95d8701e21c4ae30a7ac85560eebe7658d79
Signed-off-by: Nicholas Chin <nic.c3.14@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/77324
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de>

util/board_status/board_status.sh

@@ -553,7 +553,7 @@ if [ $UPLOAD_RESULTS -eq 1 ]; then
 	git add "${vendor}"
 	git commit -a -m "${mainboard_dir}/${tagged_version}/${timestamp}"
 	count=0
-	until git push origin master || test $count -eq 3; do
+	until git push origin main || test $count -eq 3; do
 	        git pull --rebase
 		count=$((count + 1))
 	done