omni_emulator: make it work for 12

Change-Id: I10035855690e07e7c57087a6a9698a2935a71647
diff --git a/utils/omni_emulator/fstab.ranchu.initrd b/utils/omni_emulator/fstab.ranchu.initrd
index e792feb..c379960 100644
--- a/utils/omni_emulator/fstab.ranchu.initrd
+++ b/utils/omni_emulator/fstab.ranchu.initrd
@@ -2,3 +2,4 @@
 #<dev>  <mnt_point> <type>  <mnt_flags options> <fs_mgr_flags>
 system   /system     ext4    ro,barrier=1     wait,logical,avb=vbmeta,first_stage_mount
 vendor   /vendor     ext4    ro,barrier=1     wait,logical,first_stage_mount
+/dev/block/pci/pci0000:00/0000:00:06.0/by-name/metadata    /metadata    ext4    noatime,nosuid,nodev    wait,formattable,first_stage_mount