Do not populate `ro.kernel.` properties in init

`ro.kernel.` is deprecated, emulator migrated to
`ro.boot.`.

Bug: 182291166
Test: presubmit
Signed-off-by: Roman Kiryanov <rkir@google.com>
Change-Id: I074f9a63dc4e3edcc01930b2e8481efd1d85eb55