Add interface/NIC documentation to NBDE section

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The RHEL Security Guide's section on using Network Bound Disk Encryption for Policy-Based Decryption (section 4.10.6) doesn't provide enough information for configuring static IP addressing in the dracut/initramfs. It is missing the information for choosing the interface (e.g. eth0, eth1, etc...)

I was able to use an alternative method, but it looks ugly.

echo 'kernel_cmdline="ip="' > /etc/dracut.conf.d/static-ip.conf

How can I specify the interface using your syntax, which is much prettier?