Revert "ANDROID: Incremental fs: Add zstd feature flag"

This reverts commit ea66b381.

Set incfs back to rvc shipping incfs

Bug: 178509184
Test: incfs_test passes
Signed-off-by: Paul Lawrence <paullawrence@google.com>
Change-Id: Idda973c1d6b5be43eee6130aa1de2e601b35ae75