cpu: move cpuload/cpuchunks options into private engine option space

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/HOWTO b/HOWTO
index e4614ea..091484a 100644
--- a/HOWTO
+++ b/HOWTO
@@ -1150,12 +1150,6 @@
 ioscheduler=str	Attempt to switch the device hosting the file to the specified
 		io scheduler before running.
 
-cpuload=int	If the job is a CPU cycle eater, attempt to use the specified
-		percentage of CPU cycles.
-
-cpuchunks=int	If the job is a CPU cycle eater, split the load into
-		cycles of the given time. In microseconds.
-
 disk_util=bool	Generate disk utilization statistics, if the platform
 		supports it. Defaults to on.
 
@@ -1286,6 +1280,11 @@
 		enabled when polling for a minimum of 0 events (eg when
 		iodepth_batch_complete=0).
 
+[cpu] cpuload=int Attempt to use the specified percentage of CPU cycles.
+
+[cpu] cpuchunks=int Split the load into cycles of the given time. In
+		microseconds.
+
 [netsplice] hostname=str
 [net] hostname=str The host name or IP address to use for TCP or UDP based IO.
 		If the job is a TCP listener or UDP reader, the hostname is not