samples: Updated to use new hip include path

Change-Id: I53a1385a17f13a997ea21d14315f15a3ad851dab

samples/2_Cookbook/1_hipEvent/hipEvent.cpp

@@ -22,7 +22,7 @@ THE SOFTWARE.
 #include<iostream>
 
 // hip header file
-#include "hip_runtime.h"
+#include "hip/hip_runtime.h"
 
 #define WIDTH     1024
 #define HEIGHT    1024