thermal: intel: Remove explicit user_space governor selection

Currently some user space programs like Linux thermald needs to register
to get notifications from both thermal user space governor and also
Thermal netlink. This is required as some messages like HFI (Hardware
Feedback Notifications) requires Thermal netlink.

This results in additional processing in kernel and user space to process
both notifications. The cost of using user space governor using
kobject_uevent is much higher as this is also used by other user space
daemons like udev daemon.

Do not select user_space thermal governor by default. If it is present
user space programs can always use this governor by writing to
"policy" attribute.

Instead from the kernel select THERMAL_NETLINK. Trip temperature
violation can be received by user space programs via thermal netlink
events:
THERMAL_GENL_EVENT_TZ_TRIP_UP
THERMAL_GENL_EVENT_TZ_TRIP_DOWN

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Link: https://patch.msgid.link/20241216190821.1137162-1-srinivas.pandruvada@linux.intel.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

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