Fix some trivial warnings in WifiP2pDevice.java

Add some missing @Override annotations, and mark some constants
as unused.

Bug: 28799169
Change-Id: I1ddef87ecb089b62e299544ae94a21d10ef42d98
Test: Compiles.
(cherry picked from commit 7d66daabd36acdaf824de6fb1b0e4cd088283d31)
1 file changed
tree: 950ef405adef1c10234acf901b907d4a400363b5
  1. framework/