added device functions header to hip_runtime.h

Change-Id: I635931e1fbe4b7f0f64f3a126c0f1badcd6d234b

include/hip/hcc_detail/hip_runtime.h

@@ -70,6 +70,7 @@ extern int HIP_TRACE_API;
 #endif
 #include <hip/hcc_detail/host_defines.h>
 #include <hip/hcc_detail/math_functions.h>
+#include <hip/hcc_detail/device_functions.h>
 
 // TODO-HCC remove old definitions ; ~1602 hcc supports __HCC_ACCELERATOR__ define.
 #if defined (__KALMAR_ACCELERATOR__) && !defined (__HCC_ACCELERATOR__)