Allow Resolvable Private Address into LE White List

When doing background connection, we don't want to put RPA into the
white list, as it might expire in 15 minutes.
For direct connect procedure, RPA is ok - the request times out after 30
seconds.

This patch moves address type check from the White List to the background
connection procedure. It is prepearation for handling direct connect
with white list.

Bug: 112827989
Test: sl4a GattConnectTest
Change-Id: I907ad44d1d255c9212ed58112bb8b99464e46f43