thermal: intel: int340x: Allow temperature override

thermal: intel: int340x: Allow temperature override

Add debugfs interface to override hardware provide temperature. This
interface can be used primarily for debug. Alternatively this can
be also used to use hardware control loops to manage temperature for
virtual sensors. Virtual sensors are soft sensors created by kernel/
user space aggregating other sensors.

There are three attributes to override the maximum three instances of
platform temperature control.
/sys/kernel/debug/platform_temperature_control/
├── temperature_0
├── temperature_1
└── temperature_2

These are write only attributes requires admin privilege. Any value
greater than 0, will override the temperature. A value of 0 will
stop overriding the temperature.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Reviewed-by: Zhang Rui <rui.zhang@intel.com>
Link: https://patch.msgid.link/20250613214923.2910397-2-srinivas.pandruvada@linux.intel.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>