Remove kernel.cmdline

Flintlock now defaults a standard required set, and this field has
changed from 'cmdline: ""' to 'cmdline.additionalProperties: ""'.

Author: Callisto13

example.json

@@ -8,7 +8,6 @@
     "memory_in_mb": 2048,
     "kernel": {
       "image": "ghcr.io/weaveworks/flintlock-kernel:5.10.77",
-      "cmdline": "console=ttyS0 reboot=k panic=1 pci=off i8042.noaux i8042.nomux i8042.nopnp i8042.dumbkbd ds=nocloud-net;s=http://169.254.169.254/latest/",
       "filename": "boot/vmlinux",
       "add_network_config": true
     },

main.go

@@ -353,7 +353,6 @@ func defaultMicroVM(name, namespace, sshPath string) (*types.MicroVMSpec, error)
 		MemoryInMb: 2048,
 		Kernel: &types.Kernel{
 			Image:            kernelImage,
-			Cmdline:          "console=ttyS0 reboot=k panic=1 pci=off i8042.noaux i8042.nomux i8042.nopnp i8042.dumbkbd ds=nocloud-net;s=http://169.254.169.254/latest/",
 			Filename:         pointyString("boot/vmlinux"),
 			AddNetworkConfig: true,
 		},