sys/syz-extract: re-enable extraction for fsverity.txt
sys/syz-extract: re-enable extraction for fsverity.txt

fsverity is now upstream, so re-enable extracting its consts.

xairy/syzkaller,google/syzkaller,xairy/syzkaller,xairy/syzkaller,google/syzkaller,xairy/syzkaller,google/syzkaller,xairy/syzkaller,xairy/syzkaller,google/syzkaller,google/syzkaller,google/syzkaller,google/syzkaller,xairy/syzkaller