ANDROID: Incremental fs: Remove signature checks from kernel

Test: selftests pass
Bug: 133435829
Signed-off-by: Paul Lawrence <paullawrence@google.com>
Change-Id: Ia7e69b1b0176202da4b418ea815b370cbdacd5c2
Git-commit: 73e7d656
Git-repo: https://android.googlesource.com/kernel/common/


Signed-off-by: Sayali Lokhande <sayalil@codeaurora.org>