LinkProperties: use ordered comparison for P-CSCFs.

P-CSCF list is ordered list. Two lists with same servers but
in different order are not equal. Use proper comparison.

The P-CSCF address is a kind of entry point (proxy) of Server
for IMS transaction between device and IMS Server.  It can have
multiple addresses as a list. Even if the same addresses have
different orders, it is assumed that the server order has changed.

Bug: 268479036
Test: TreeHugger
(cherry picked from https://android-review.googlesource.com/q/commit:b0fc6627a6f76c02f3e420bbdd0a86581c955234)
Merged-In: Ia1884f37739a20d871dd0024cc72cb18c083dc8e
Change-Id: Ia1884f37739a20d871dd0024cc72cb18c083dc8e