sunxi: Unify devices.c

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
sun7i-cpufreq: Fix dvfs support

Make dvfs support compile and change sunxi_cpufreq_initcall from a
module_init function to a late_initcall (*), so that it loads after the
axp power driver, and thus can get to the Vcore regulator.

*) sun7i-cpufreq is never build as a module.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
sun7i-cpufreq: Sanitize log output

Signed-off-by: Hans de Goede <hdegoede@redhat.com>