APF: also drop any ICMPv6 RSs

Test: new unit test + $ runtest franeworks-net
Bug: 32833400

(cherry picked from commit f98182ef5e80ede5de7f2c2a5f40fc92a46c9704)

Change-Id: Ifaf6e778c811c7d865c790a293b1fce3f43cad1c
2 files changed