[Wi-Fi] Remove unsupported EAP methods for WPA3-Enterprise 192-bit - II

Refine code:
1. Change method name from getSpinnerAdapterWithEapMethods to getSpinnerAdapter
   and apply it to other Spinner adapters.
2. Change method name from getSpinnerArrayWithEapMethodsTts to
   getSpinnerAdapterWithEapMethodsTts and it will
   setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
   for adapters.
3. Remove the code of ag/8693033
4. Improve indentation.

Bug: 135127581
Test: WifiConfigControllerTest
Change-Id: I653eda11ca1b8235c5ecaa1a826a2fddd004d2e1