clang: add header for uint32_t

fixes the below error related to unknown type name `uint32_t`:

'''
error: unknown type name 'uint32_t' [clang-diagnostic-error]
'''

Change-Id: I13b5ebb1ad5e8484910300ffe5aaa1edac0d3cd8
Signed-off-by: Jayanth Othayoth <ojayanth@gmail.com>
diff --git a/host_transport_exts.hpp b/host_transport_exts.hpp
index 8e218ee..23db4d1 100644
--- a/host_transport_exts.hpp
+++ b/host_transport_exts.hpp
@@ -1,3 +1,5 @@
+#include <cstdint>
+
 namespace phosphor
 {
 namespace dump