thermal: int340x: processor_thermal: Use module_pci_driver() macro

Since PCI provides helper macro module_pci_driver(), the
module_init/exit code can be replaced with it.

Signed-off-by: Shang XiaoJing <shangxiaojing@huawei.com>
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>