[CPUFREQ] Fix reset-to-max-speed on unloading of longhaul driver.

[CPUFREQ] Fix reset-to-max-speed on unloading of longhaul driver.

From: Sven Traenkle

The second part adresses a problem of resetting the max cpu-freq when
unloading the driver. This didn't work for my cpu and I doubt it does
for other. There is no need to pass the computed index of the max.
multiplier in the clock_ratio[] table to longhault_table[] cause the
longhaul_setstate function works with the clock_ratio[] index.

Changing the while loop to a for loop with upper limit isn't actually
necessary as long as the driver is bug free, but thats IMHO not yet the
case, so I suggest this change in order to not loop endlessly or read
beyond the limits of the clock_ratio array.

Signed-off-by: Dave Jones <davej@redhat.com>