Use soong_zip for platform.zip

soong_zip produces more reproducible zip files that are not
affected by umask values or timestamps.

This partially reapplies I2eca2f7618e06c0b5893ff54c79261921fe051d6
with fixes for 64-bit only builds and directories that are changing
during zipping.

Bug: 69500920
Test: m checkbuild
Test: m checkbuild platform
Test: lunch hikey64_only && m platform
Test: contents of zips is unchanged
Change-Id: Iac5c43276f7ae700d4d13d0ef27003d09c1c87e0