finalization: remove 'update' scripts

alexbuy@ said:

    please remove both update-* scripts. they were part of r&d project
    that was never finished

Ignore-AOSP-First: b/304316873#comment10

Bug: 314010935
Test: N/A
Change-Id: Iecc22cc860ba67fec336adb0c5b93f51677dc9ce