dmaiperf obtains the cpu's workload by using the Cpu_getLoad() function, which
in some cases returns incongruous values (over 100%).
The patch makes dmaiperf calculate this value by reading the
"/proc/stat" file and using the elapsed time from one
measurement to another.
As it only reads the addition of the workload and doesn't check for multiple
cores, values for multiple cores' systems may not be accurate.