configstore: remove configstore 1.1

Configstore was up-revisioned from 1.0 to 1.1. However no new
APIs were added to 1.1. Therefore configstore in master will be down
revisioned to 1.0.

Bug: 71555815
Test: build & boot test on taimen
Change-Id: Id7679158054468825d6f5f265ae96ac223beb3c8