Revert "Let kernel handle request for cmd line"

This reverts commit 0fcb689db96c7865a92727408043cbd91f200fb6.
Revert "Don't override the initrd size"

This reverts commit 619e638f110d5156db5c4bdfcd81fdbaf05f86e1.
Revert "Revert "init: option to override bootloader initrd size""

This reverts commit a33ca13fadb6636935a3e7777aa26ab020416820.