wifi: add RequiresApi annotations

Note: All of the parameter/API which introduced in S in SoftApConfiguration
can't support in R even if it doesn't relate HAL. Because it will mess the
configuration which backup in cloud and break configuration backup/restore
from R (mainline updated) -> R.

Bug: 181358771
Test: atest FrameworksWifiApiTests
Test: atest FrameworksWifiTests
Change-Id: I64e7f5f27dc4ea4f4e851420e135617070a81ab3
7 files changed