Add support for stub audio HAL in HIDL mode

Bug: 34360879
Test: make and check stub HAL is loaded in HIDL passthrough mode
Change-Id: Ib0d3d66aef802ae3685c17297eb87da0b5b0cc3a
diff --git a/media/libaudiohal/DevicesFactoryHalHidl.cpp b/media/libaudiohal/DevicesFactoryHalHidl.cpp
index 6444079..3ab2325 100644
--- a/media/libaudiohal/DevicesFactoryHalHidl.cpp
+++ b/media/libaudiohal/DevicesFactoryHalHidl.cpp
@@ -59,6 +59,9 @@
     } else if(strcmp(name, AUDIO_HARDWARE_MODULE_ID_REMOTE_SUBMIX) == 0) {
         *device = IDevicesFactory::Device::R_SUBMIX;
         return OK;
+    } else if(strcmp(name, AUDIO_HARDWARE_MODULE_ID_STUB) == 0) {
+        *device = IDevicesFactory::Device::STUB;
+        return OK;
     }
     ALOGE("Invalid device name %s", name);
     return BAD_VALUE;