presto: wifi: remove custom wifi changes

We have a fork of the main repository and don't need this change.

Now only need this commit to complete: https://github.com/PantechDevTeam/android_hardware_libhardware_legacy/commit/296a9d66c95fa0dceca181edfc750cdf562ddee1

Change-Id: I19adffca046dff47aabfeafd68826d8a25d049a9