Use soong_zip and zip2zip to make dist faster

soong_zip parallelizes the compression when creating a zip file, which
makes these packaging steps far shorter.

zip2zip skips the decompression and recompression during the -img- file
creation.

For an aosp_arm64-eng aosp/master build:

target_files.zip: 92s to 60s
symbols.zip: 147s to 7s
img.zip: 64s to 0.5s

There's still room to parallelize the image compression during
target_files.zip (add_img_to_target_files step takes most of the time)

Change-Id: I7b6a91e4a7dbeda2e49ca936b10181cff2f973d7