Migrate WifiCommand to WifiShellCommand

Migrate `svc wifi` to `cmd wifi set-wifi-enabled`
since WifiCommand can no longer access @hide
IWifiManager.aidl.

Bug: 138801922
Test: adb shell svc wifi [enable|disable|asdf|""]
Test: adb shell cmd wifi set-wifi-enabled [enabled|disabled|asdf|""]
Change-Id: I28d1cb2f33eb9e2890a3208a26a0ccc8fc25840b
3 files changed