nfc(api): Remove fg checks from API class

Instead of checking this in the API class, throw a remote exception from
service when we detect that a non-fg app is trying to enable/disable fg
dispatch. The service is already tracking the app moving to background,
so there is no need for this redundant tracking in the API class.

Bug: 263565738
Test: atest CtsNfcTestCases
Test: CtsVerifier tag tests
Change-Id: Ia04848f6ed2595b33a861427d1d346d0dc9da8a5