No more poking into registers via /dev/mem.
If there is no cpufreq support in the kernel, when trying to change the frequency a message will be printed on stderr that the required sysfs file cannot be opened.
Using the wrong order caused the default value to be used for JZ_EXTAL.
This is the wrong value for the Dingoo A320 and for the Ben NanoNote,
but since none of the functions that use this value are called the actual
result is nothing but a warning.
