iorap: Enable perfetto-based readahead prefetching for all devices

* Change defaults to enable readahead/perfetto on all devices.
* Enables out-of-process readahead with iorap.prefetcherd by default.

Bug: 141378186
Test: manual (logcat)
Change-Id: Ib085d54a3b97c7dbc141d152d4d111770f1d72d2
2 files changed