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: I9031a37c84e17c2cf5c0552d1b33e8fd59216b92

Change-Id: I4ad80b1584f9f80dffed7786739b80f3aaf88cdc