Clean up kernel launch output (#569)

* clean up output from kernel_launch

* set RUN_WARMUP to 0 by default

* split the warm-up into a separate issue

---------
Co-authored-by: zjing14 <zhangjing14@gmail.com>

include/ck/host_utility/kernel_launch.hpp

@@ -20,6 +20,7 @@ float launch_and_time_kernel(const StreamConfig& stream_config,
 #if CK_TIME_KERNEL
     if(stream_config.time_kernel_)
     {
+#if DEBUG_LOG
         printf("%s: grid_dim {%d, %d, %d}, block_dim {%d, %d, %d} \n",
                __func__,
                grid_dim.x,
@@ -29,15 +30,15 @@ float launch_and_time_kernel(const StreamConfig& stream_config,
                block_dim.y,
                block_dim.z);
 
-        const int nrepeat = 10;
-
         printf("Warm up 1 time\n");
-
+#endif
         // warm up
         kernel<<<grid_dim, block_dim, lds_byte, stream_config.stream_id_>>>(args...);
 
+        const int nrepeat = 10;
+#if DEBUG_LOG
         printf("Start running %d times...\n", nrepeat);
-
+#endif
         hipEvent_t start, stop;
 
         hip_check_error(hipEventCreate(&start));