WifiInfo: App attribution for suggestion/request

Add a field to store package name for suggestion/specifier package name.
Storing these info in WifiInfo is the convention being followed
for ephemeral networks in WifiTracker.

Bug: 115504887
Bug: 113878056
Test: ./frameworks/base/wifi/tests/runtests.sh
Change-Id: Iab6ab93a2a281011499adfff3163c35058600706