Add tools to host package for rebuilding super.img

lpmake and lpunpack are used to create super.img and extract logical
partitions from super.img, which are needed if we want to mix images
from different targets (e.g., GSI + CF vendor) to form new super.img.

Bug: 134461288
Test: $ lunch aosp_cf_x86-userdebug
      $ m dist
      $ tar xf cvd-host_package.tar.gz
      $ bin/lpmake
      (proper usage text)
      $ bin/lpunpack
      (proper usage text)

Change-Id: Id445bc5d1f1f871af9d66e9a4e19a7e015aae69b
1 file changed