hal: Add missing includes

* pthread.h include was missing so we add it.
* Fixes compilation with BOARD_VNDK_VERSION.

Change-Id: I297a0fc0cf4763b3550e1a8d37f2653b77b6e3a8
diff --git a/hal/platform_info.c b/hal/platform_info.c
index 4ad5a5c..84f56a1 100644
--- a/hal/platform_info.c
+++ b/hal/platform_info.c
@@ -41,6 +41,7 @@
 #include "platform_api.h"
 #include "audio_extn.h"
 #include <platform.h>
+#include <pthread.h>
 #include <math.h>
 
 #ifdef DYNAMIC_LOG_ENABLED