Revert "templates: archlinux: use 9p for better stability"

This reverts commit 044cb12.

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>

Author: AkihiroSuda

examples/archlinux.yaml

@@ -16,8 +16,5 @@ mounts:
 - location: "~"
 - location: "/tmp/lima"
   writable: true
-# reverse-sshfs seems unstable with ArchLinux ?
-mountType: "9p"
-vmType: "qemu"
 firmware:
   legacyBIOS: true