hal: mark unused parameters correctly

Some of the parameters passed to functions in older platforms
are not used anymore, though we maintain the platform code for
backward compatibility.
Mark the unused parameter explicitely as __unused.

Change-Id: I814f5f233590ecfd3e79bf58b97ad6d37be74601
diff --git a/hal/msm8960/platform.c b/hal/msm8960/platform.c
index b72cae9..8d5004d 100644
--- a/hal/msm8960/platform.c
+++ b/hal/msm8960/platform.c
@@ -374,7 +374,7 @@
 }
 
 void platform_add_backend_name(char *mixer_path, snd_device_t snd_device,
-                               struct audio_usecase *usecase)
+                               struct audio_usecase *usecase __unused)
 {
     if (snd_device == SND_DEVICE_IN_BT_SCO_MIC)
         strlcat(mixer_path, " bt-sco", MIXER_PATH_MAX_LENGTH);
@@ -1172,3 +1172,8 @@
 {
     return 0;
 }
+
+void platform_set_gsm_mode(void *platform __unused, bool enable __unused)
+{
+    ALOGE("%s: Not implemented", __func__);
+}
diff --git a/hal/msm8974/platform.c b/hal/msm8974/platform.c
index d693aae..a510afe 100644
--- a/hal/msm8974/platform.c
+++ b/hal/msm8974/platform.c
@@ -1148,7 +1148,7 @@
 
         ret = 0;
 
-        if((plat_data->is_vbat_speaker) && (WCD9XXX_VBAT_CAL == type)) {
+        if ((plat_data->is_vbat_speaker) && (WCD9XXX_VBAT_CAL == type)) {
            ret = send_vbat_adc_data_to_acdb(plat_data, cal_name_info[type]);
            if (ret < 0)
                ALOGE("%s error in sending vbat adc data to acdb", __func__);
@@ -1657,7 +1657,7 @@
         return;
     }
 
-    if((snd_device == SND_DEVICE_OUT_VOICE_SPEAKER_VBAT) &&
+    if ((snd_device == SND_DEVICE_OUT_VOICE_SPEAKER_VBAT) &&
         !(usecase->type == VOICE_CALL || usecase->type == VOIP_CALL)) {
         ALOGI("%s: Not adding vbat speaker device to non voice use cases", __func__);
         return;