FROMLIST: PM: EM: Add min/max available performance state limits

On some devices there are HW dependencies for shared frequency and voltage
between devices: CPUs and L3 cache. When the L3 cache frequency is
increased, the affected CPUs might run at higher voltage and frequency.
That higher voltage causes higher CPU power and thus more energy is used
for running the tasks.

Add performance state limits which are applied for the device. This allows
the Energy Model (EM) to better reflect the CPU's currently available
performance states. This information is used by Energy Aware Scheduler
(EAS) during task placement to avoid situation when a simulated energy
cost has error due to using wrong Power Domain (PD) frequency.

The function performs only bare minimum checks (and requires EM as
an argument) to reduce the overhead.

Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
Change-Id: I2dcf541590d6473b6fc0f574a73f07f3c31d7900