Add keywords for AOD setting.

Used the WiFi slice for inspiration: ag/6793584

Also added "ambient" to the keywords, since "ambient display" is another
phrase used for AOD.

Bug: 279029717
Test: manually checked that the setting shows up when searching for
"aod"
Change-Id: I8a3a4a6635c9724565426b859722242d2bae9e49