hal: Fix incorrect channel setting for Mmap record path

Fix incorrect channel setting for Mmap record path.

Change-Id: Iff8c236030c458a685a3e82967827cc1b226ad3a
CRs-Fixed: 2355821
diff --git a/hal/audio_hw.c b/hal/audio_hw.c
index f918a86..fc9a83b 100644
--- a/hal/audio_hw.c
+++ b/hal/audio_hw.c
@@ -7282,6 +7282,7 @@
         in->usecase = USECASE_AUDIO_RECORD_MMAP;
         in->config = pcm_config_mmap_capture;
         in->config.format = pcm_format_from_audio_format(config->format);
+        in->config.channels = channel_count;
         in->stream.start = in_start;
         in->stream.stop = in_stop;
         in->stream.create_mmap_buffer = in_create_mmap_buffer;