Remove hardcoded kernel args

[ProbstDJakob]

Is there a reason to keep the hardcoded kernel args?

bootc-image-builder/bib/cmd/bootc-image-builder/image.go

Lines 335 to 341 in b35eaa8

	img.KernelOptionsAppend = []string{
	"rw",
	// TODO: Drop this as we expect kargs to come from the container image,
	// xref https://github.com/CentOS/centos-bootc-layered/blob/main/cloud/usr/lib/bootc/install/05-cloud-kargs.toml
	"console=tty0",
	"console=ttyS0",
	}

The rw, at least for me, is not the problem, but the console=* args prevent me from using plymouth. As soon as I remove those args on boot via the grub editor plymouth shows up.

[cgwalters]

Yes agree we should drop them, though in practice we probably should try to move some of it to the base image, as it will mean that default VMs lose consoles.