chore: don't append initrd= to the kernel command line

I believe it serves no purpose in GRUB config: GRUB pre-loads
`initramfs` into memory anyways, so kernel doesn't need to know, nor has
now way to load it from anywhere.

Signed-off-by: Andrey Smirnov <andrey.smirnov@talos-systems.com>

cmd/installer/pkg/install/install.go

@@ -7,7 +7,6 @@ package install
 import (
 	"fmt"
 	"log"
-	"path/filepath"
 
 	"github.com/talos-systems/go-blockdevice/blockdevice"
 	"github.com/talos-systems/go-procfs/procfs"
@@ -273,8 +272,6 @@ func (i *Installer) Install(seq runtime.Sequence) (err error) {
 		return nil
 	}
 
-	i.cmdline.Append("initrd", filepath.Join("/", string(i.Next), constants.InitramfsAsset))
-
 	var conf *grub.Config
 	if i.bootloader == nil {
 		conf = grub.NewConfig(i.cmdline.String())