SWDEV-339113 - Update sampl codes with correct kernel coordinate (#2704)

Change-Id: Ibfc0fd285441cd3d79b312d2b739729a039a6f84

samples/2_Cookbook/9_unroll/unroll.cpp

@@ -43,7 +43,7 @@ void matrixRowSum(int* input, int* output, int width) {
 
 // Device (kernel) function
 __global__ void gpuMatrixRowSum(int* input, int* output, int width) {
-    int index = hipBlockDim_x * hipBlockIdx_x + hipThreadIdx_x;
+    int index = blockDim.x * blockIdx.x + threadIdx.x;
 #pragma unroll
     for (int i = 0; i < width; i++) {
         output[index] += input[index * width + i];