omni: rework emulator config

Change-Id: Iae64074404a290f96c82bb304298de76eb91d6da
diff --git a/utils/omni_emulator/fstab.ranchu.initrd b/utils/omni_emulator/fstab.ranchu.initrd
new file mode 100644
index 0000000..e792feb
--- /dev/null
+++ b/utils/omni_emulator/fstab.ranchu.initrd
@@ -0,0 +1,4 @@
+# Android fstab file for ramdisk
+#<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