Migrate frameworks/base/wifi & frameworks/base/packages/OsuLogin

Migrate to packages/modules/Wifi.  This CL will be presubmit tested
once migration is complete.  This CL drops the code from
frameworks/base/wifi and migrated to packages/modules/Wifi.
Also adjusts visibility rules in frameworks/base/Android.bp
Bug: 137323948
Test: TH
Merged-In: Id02e28648e922a30d6a81cf92b39eff4ca3cc002
Change-Id: I28e35cea55001c2333374c2342f496a0340f2f32