hal: Add missing offload changes.

Compressed offload device number and entry from the device
table is missing due to merge issue. Add the device number
to fix offload playback issues.

Change-Id: Ia3eb0e3aaef1e1a73eda5d70bb8f16711ddd182f
diff --git a/hal/msm8974/platform.c b/hal/msm8974/platform.c
index 1888253..44842b5 100644
--- a/hal/msm8974/platform.c
+++ b/hal/msm8974/platform.c
@@ -101,6 +101,8 @@
                                             LOWLATENCY_PCM_DEVICE},
     [USECASE_AUDIO_PLAYBACK_MULTI_CH] = {MULTI_CHANNEL_PCM_DEVICE,
                                          MULTI_CHANNEL_PCM_DEVICE},
+    [USECASE_AUDIO_PLAYBACK_OFFLOAD] =
+                     {PLAYBACK_OFFLOAD_DEVICE, PLAYBACK_OFFLOAD_DEVICE},
     [USECASE_AUDIO_RECORD] = {AUDIO_RECORD_PCM_DEVICE, AUDIO_RECORD_PCM_DEVICE},
     [USECASE_AUDIO_RECORD_LOW_LATENCY] = {LOWLATENCY_PCM_DEVICE,
                                           LOWLATENCY_PCM_DEVICE},