Introduce device(s) role for strategy.

Adding interface to get/set/removeDevicesRoleForStrategy. The interfaces
allows to modify the devices' role, such as preferred, for strategy.
Get/set/removePreferredDeviceForStrategy is reimplemented by the new
interfaces.

Test: atest AudioHostTest
Test: atest AudioServiceHostTest
Test: atest AudioServiceTest
Test: atest audiopolicy_tests
Bug: 160352965
Change-Id: I0af737542a8599938cae4e142b733159f21ed5a8
diff --git a/services/audiopolicy/service/AudioPolicyService.h b/services/audiopolicy/service/AudioPolicyService.h
index 3768f2e..a851863 100644
--- a/services/audiopolicy/service/AudioPolicyService.h
+++ b/services/audiopolicy/service/AudioPolicyService.h
@@ -230,14 +230,16 @@
 
     virtual status_t removeUidDeviceAffinities(uid_t uid);
 
-    virtual status_t setPreferredDeviceForStrategy(product_strategy_t strategy,
-                                                   const AudioDeviceTypeAddr &device);
+    virtual status_t setDevicesRoleForStrategy(product_strategy_t strategy,
+                                               device_role_t role,
+                                               const AudioDeviceTypeAddrVector &devices);
 
-    virtual status_t removePreferredDeviceForStrategy(product_strategy_t strategy);
+    virtual status_t removeDevicesRoleForStrategy(product_strategy_t strategy, device_role_t role);
 
+    virtual status_t getDevicesForRoleAndStrategy(product_strategy_t strategy,
+                                                  device_role_t role,
+                                                  AudioDeviceTypeAddrVector &devices);
 
-    virtual status_t getPreferredDeviceForStrategy(product_strategy_t strategy,
-                                                   AudioDeviceTypeAddr &device);
     virtual status_t setUserIdDeviceAffinities(int userId,
             const AudioDeviceTypeAddrVector& devices);