Update equals and hashCode methods of NoMan.Policy

Test: atest AudioManagerTest#testPriorityOnlyChannelsCanBypassDnd
Fixes: 142643922
Change-Id: I15835f784ba73b40eccf92a0a430905d28647669
Merged-In: I15835f784ba73b40eccf92a0a430905d28647669
(cherry picked from commit 4f8b0224e12037f5c41200722d689e1c8e0d8e1e)
3 files changed