Added processor thermal device mail box interface for workload hints
setting. These hints will give indication to hardware to better manage
power and thermals. The supported hints are:
idle
semi_active
burusty
sustained
battery_life

For example when the system is on battery, the hardware can be less
aggressive in power ramp up.

This will create an attribute group at
/sys/bus/pci/devices/0000:00:04.0/workload_request

This folder contains two attributes:
workload_available_types : (RO):  This shows available workload types
workload_type: (RW) : Allows to set and get current workload type
setting
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20201126171829.945969-4-srinivas.pandruvada@linux.intel.com