thermal: hwmon: replace deprecated strcpy() with strscpy()

thermal: hwmon: replace deprecated strcpy() with strscpy()

Since strcpy() is deprecated and the last user of it in the thermal
subsystem is thermal_hwmon_lookup_by_type(), replace strcpy() in that
function with strscpy().

Signed-off-by: Osama Abdelkader <osama.abdelkader@gmail.com>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Link: https://patch.msgid.link/20250903192059.11353-1-osama.abdelkader@gmail.com
[ rjw: Changelog rewrite ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>