Initramfs does not support vlans, you will have to use a hook script to add the 8021q module. https://github.com/skom91/initramfs-tools-network-hook
Your IP line seems wrong, why do you add 2 gateways at the end ?
This is mine:
# static ip
cat << 'EOF' >> /etc/initramfs-tools/initramfs.conf...