vz: support `video.display`

[AkihiroSuda]

lima/examples/default.yaml

Lines 226 to 233 in 871a320

	video:
	# QEMU display, e.g., "none", "cocoa", "sdl", "gtk", "default".
	# Choosing "none" will hide the video output, and not show any window.
	# Choosing "default" will pick the first available of: gtk, sdl, cocoa.
	# As of QEMU v6.2, enabling this is known to have negative impact
	# on performance on macOS hosts: https://gitlab.com/qemu-project/qemu/-/issues/334
	# 🟢 Builtin default: "none"
	display: null

I guess we can add a new value "vz" here