Override IMAGE_ROOTFS_EXTRA_SPACE
AGL sets this to 500MB to allow extra space in the default image.  Set it to 0
in the initramfs.
@@ -21,6 +21,10 @@ inherit core-image
IMAGE_ROOTFS_SIZE = "8192"
+# Users will often ask for extra space in their rootfs by setting this
+# globally. Since this is a initramfs, we don't want to make it bigger
+IMAGE_ROOTFS_EXTRA_SPACE = "0"
+
BAD_RECOMMENDATIONS += "busybox-syslog"
