Create super_empty.img using Soong

The build rule for this .img file will be created in super_image. It
will use the a minimized file returned by `buildMiscInfo` without any
partition information. This file will be disted in target_files.zip

Bug: 390192334
Test: Verified that this file is bit-identical between make and soong
for aosp_cf_x86_64_phone

Change-Id: I9238d67d2ca8739064509a858d5251f2641896e9