Support Samsung 2SI with skip_initramfs in dtb cmdline

Samsung Galaxy A21S and Galaxy M12, probably others, are hdr_v2 boot.img with 2SI judging by the ramdisk contents, but the dtb contains an extra cmdline with skip_initramfs present, even though this shouldn't exist on 2SI and the kernel apparently doesn't even contain a skip_initramfs function

I can't find examples of other devices where skip_initramfs is present in the dtb other than these so patch it out like we do the kernel

Co-authored-by: topjohnwu <topjohnwu@gmail.com>
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