Change fs-verity setup to the new format

This is due to upstream kernel API change.  With simpler API, many setup
code can now be removed.

Test: atest com.android.cts.apkverity.ApkVerityTest
Bug: 112037636
Change-Id: Ie88d55630b5d20ddbcbea4be7af9cf1fee47e44a
Merged-In: Ie88d55630b5d20ddbcbea4be7af9cf1fee47e44a
(cherry picked from commit 40ed1b4abd6abbf422fed44f648a06f6e73d65f6)
3 files changed