hal: Add missing pthread.h include

* Required after LA.UM.8.4.r1-04500-8x98.0 merge

Change-Id: I2464b1223586168cf7a4ec8f61b3979ee8da3a40
diff --git a/hal/platform_info.c b/hal/platform_info.c
index b0e83b3..e99a418 100644
--- a/hal/platform_info.c
+++ b/hal/platform_info.c
@@ -40,6 +40,7 @@
 #include "platform_api.h"
 #include <platform.h>
 #include <math.h>
+#include <pthread.h>
 
 #ifdef DYNAMIC_LOG_ENABLED
 #include <log_xml_parser.h>