hal: changing mtmx coeffs variable type to uint32_t

- uint64_t pointer causes data mismatch b/w hal and kernel

Change-Id: I0fd8ece82661aea91511a05d8998451767774877
diff --git a/hal/platform_api.h b/hal/platform_api.h
index 9663372..1d40a86 100755
--- a/hal/platform_api.h
+++ b/hal/platform_api.h
@@ -149,7 +149,7 @@
 struct audio_custom_mtmx_params {
     struct listnode list;
     struct audio_custom_mtmx_params_info info;
-    uint64_t coeffs[0];
+    uint32_t coeffs[0];
 };
 
 struct audio_custom_mtmx_in_params_info {