Bluetooth: Set isPreferred to true for PanProfile Connections.

isPreferred is always true for PAN profile so that DUT can
initiate connection with remote device. Curretnly we are
returning true only when pan profile is in connected, so
it will return false when pan profile is not connected and
will never initiate connection on click.

Change-Id: I7c789add73ca944d074b0ecd8af223f6d61b547a
CRs-fixed: 463887
(cherry picked from commit ca3988a7394eb189835647a5aaa04707fe5c2517)
(cherry picked from commit ea5ce47bf7b918affc66467adf4e38b1c870e86f)
(cherry picked from commit 2a3bfb2ed0102de6aa6e659ee7714ce8fcec25cd)