Convert mask types from uint32_t to enum type

This applies to the following types:

- audio_gain_mode_t;
- audio_flags_mask_t;
- audio_channel_representation_t;
- audio_channel_mask_t;
- audio_devices_t.

Enum types are distinct thus proper overloading on the type
is possible in C++. Also, assignments to enum types are
less prone to errors.

Bug: 169889714
Test: basic audio functionality
Change-Id: I8f1e6fa2bbad8900fdae66f01ac70c75953fd62c

1 files changed, 2 insertions, 1 deletions

diff --git a/modules/audio_remote_submix/audio_hw.cpp b/modules/audio_remote_submix/audio_hw.cpp
index 103f57dc..72e1fa55 100644
--- a/modules/audio_remote_submix/audio_hw.cpp
+++ b/modules/audio_remote_submix/audio_hw.cpp
@@ -675,7 +675,8 @@ static audio_channel_mask_t out_get_channels(const struct audio_stream *stream)
 {
     const struct submix_stream_out * const out = audio_stream_get_submix_stream_out(
             const_cast<struct audio_stream *>(stream));
-    uint32_t channel_mask = out->dev->routes[out->route_handle].config.output_channel_mask;
+    audio_channel_mask_t channel_mask =
+            out->dev->routes[out->route_handle].config.output_channel_mask;
     SUBMIX_ALOGV("out_get_channels() returns %08x", channel_mask);
     return channel_mask;
 }