Generate stronger default password for tethered AP

Increase password entropy for tethered hotspot to 2^75 (used to be 2^48).
The password length is increased to 15 chars from range a-z, 0-9 (minus
symbols that may look confusing on the screen).

Bug: 142068677
Test: atest com.android.server.wifi
Change-Id: Iae488b8dfceb6a2f5ccf476af8eabcfc03507bdf
2 files changed
tree: 50c3fd24a6c18e489e32986ab23be6dd618737bf
  1. service/
  2. PREUPLOAD.cfg