Script to compute the difference in two system image folders.

Bug: 70673785
Test: development/vndk/tools/system_image_diff.py \
Test:   out/target/product/crosshatch \
Test:   out/target/product/generic_arm64_ab | \
Test:   LC_COLLATE=C sort > /tmp/system_image_diff.csv
Change-Id: I3559bbb8ad298bbcbaab8fa9e8e350b391873887