Fix compile error with g++ 7.3

Get the below error message when compiling with g++ 7.3:
selutility.hpp:131:6: error: 'chrono' in namespace 'std' does not name a type

Change the include order to fix this issue

Change-Id: Ieaac302dd2e411a71736cbbe3f92431e30f3f5ea
Signed-off-by: Yong Li <yong.b.li@linux.intel.com>
1 file changed