wifi: Fix SAP callback in registration

When there were clients connected to SAP, a new register should receive
SoftApCallback#onConnectedClientsChanged(SoftApInfo, List<WifiClient>)}
to know clients in each instance.

Also fix java doc typo.

Bug: 186366736
Test: atest -c FrameworksWifiApiTests
Change-Id: I06153383388fe9a8385cb58f6f2c1fcc415b0326
2 files changed