AHAL: enable audio hal for linux platform

Change-Id: I7de481eb7b04985f232dfe833d76e80907081bdb
Signed-off-by: Hexuan Zhu <hexuzhu@codeaurora.org>
diff --git a/hal/platform_info.c b/hal/platform_info.c
old mode 100644
new mode 100755
index 4ad5a5c..e55b91d
--- a/hal/platform_info.c
+++ b/hal/platform_info.c
@@ -42,6 +42,9 @@
 #include "audio_extn.h"
 #include <platform.h>
 #include <math.h>
+#ifdef LINUX_ENABLED
+#include <float.h>
+#endif
 
 #ifdef DYNAMIC_LOG_ENABLED
 #include <log_xml_parser.h>