After `Settings > System > Languages & input` was separated into
`Settings > System > Languages` and `Settings > System > Keyboard`,
`On-device speech recognition` was lost. This CL adds it in the same
`Speech` preference category where it was before
and moves the category to `Settings > System > Languages`.
Bug: 278279110
Test: Manual, already existing robotests
Change-Id: I040c284dd3596f35ceacb6980ff89e611e29971c
Currently under `Settings > System > Languages & input > Speech` there
is a `Voice input` entry with a cog which starts the SSBG model manager
settings activity. Under the same preference group another entry
labeled `On-device recognition` is added which would open a similar
model manager settings activity, but for the on-device recognizer. That
settings activity is yet to be implemented.
The new entry should appear only under the following conditions:
- An on-device speech recognition service must be available in the
system.
- A speech recognition service with a proper settings activity
meta-data must exist in the same package as the default on-device
speech recognition service.
Bug: 235457391
Test: Manual, already existing robotests
Change-Id: I17208c8725500ccb3dd2fa51a12b003d32073c4e
