PM / devfreq: Add sysfs node to expose available frequencies

devfreq governors such as ondemand are controlled by a min and
max frequency, while governors like userspace governor allow us
to set a specific frequency.
However, for the same specific device, depending on the SoC, the
available frequencies can vary.

So expose the available frequencies as a snapshot over sysfs to
allow informed decisions.

This was inspired by cpufreq framework's equivalent for similar
usage sysfs node: scaling_available_frequencies.

Cc: Rajagopal Venkat <[email protected]>
Cc: MyungJoo Ham <[email protected]>
Cc: Kyungmin Park <[email protected]>
Cc: "Rafael J. Wysocki" <[email protected]>
Cc: Kevin Hilman <[email protected]>
Cc: [email protected]
Cc: [email protected]

Signed-off-by: Nishanth Menon <[email protected]>
Signed-off-by: MyungJoo Ham <[email protected]>

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