Add metadata partition for non-system-as-root builds

Test: build with TARGET_BUILD_SYSTEM_ROOT_IMAGE=false and boot
Bug: 128222953
Change-Id: I291988de2ed52e1d63b2c698cd550a8cc97eacbd
diff --git a/shared/config/fstab.initrd b/shared/config/fstab.initrd
index 223c92e..b747209 100644
--- a/shared/config/fstab.initrd
+++ b/shared/config/fstab.initrd
@@ -2,5 +2,6 @@
 /dev/block/vdb /data ext4 nodev,noatime,nosuid,errors=panic wait,fileencryption=aes-256-xts:aes-256-cts
 /dev/block/vdc /cache ext4 nodev,noatime,nosuid,errors=panic wait
 /dev/block/vdd /vendor ext4 noatime,ro,errors=panic wait
+/dev/block/vde /metadata ext4 nodev,noatime,nosuid,errors=panic wait,formattable,first_stage_mount
 /dev/block/zram0 none swap defaults zramsize=75%
 /tmp /sdcard none defaults,bind recoveryonly