omni: rework emulator config

Change-Id: Iae64074404a290f96c82bb304298de76eb91d6da
diff --git a/utils/omni_emulator/fstab.ranchu b/utils/omni_emulator/fstab.ranchu
new file mode 100644
index 0000000..4a5f002
--- /dev/null
+++ b/utils/omni_emulator/fstab.ranchu
@@ -0,0 +1,6 @@
+# Android fstab file.
+#<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/vdc   /data     ext4      noatime,nosuid,nodev,nomblk_io_submit,errors=panic   wait,check,quota,fileencryption=aes-256-xts:aes-256-cts,reservedsize=128M
+/devices/*/block/vdf auto   auto      defaults    voldmanaged=sdcard:auto,encryptable=userdata