Show Hotspot network in Network & internet settings

- Show Hotspot icons

- Show getAlternateSummary instead of original getSummary

Fix: 308187592
Test: unit test
atest -c InternetPreferenceControllerTest
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:a9ea40dc71362b372c5adc89b82dbe2024253688)
Merged-In: I8afe54edebc904c9ec936f5851a33c6c20f13e29
Change-Id: I8afe54edebc904c9ec936f5851a33c6c20f13e29