Allow fs-verity setup within system_server

The original fs-verity implementation requires CAP_SYS_ADMIN and thus
the actual setup is proxied through installd.  Instead, upstream
FS_IOC_ENABLE_VERITY ioctl checks write permission to inode, and thus
can happen in system_server.

Also, replace the old measure ioctl with FS_IOC_SET_VERITY_MEASUREMENT.
Note that although the number is name, they work differently.

Test: set ro.apk_verity.mode=2, in-progress CTS passed without denial
Bug: 112037636
Change-Id: I3e8d14321df8904dfed68b83aae8b3dd99c211ac