thermal: int340x: Handle workload hint interrupts

thermal: int340x: Handle workload hint interrupts

On thermal device interrupt, if the interrupt is generated for passing
workload hint, call the callback to pass notification to the user
space.

First call proc_thermal_check_wt_intr() to check interrupt, if this
callback returns true, wake the IRQ thread to call
proc_thermal_wt_intr_callback() to notify user space.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
[ rjw: Subject adjustment, changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>