ACPI / processor: Use ACPI_PROCESSOR_DEVICE_HID instead of "ACPI0007"

Replace "ACPI0007" with ACPI_PROCESSOR_DEVICE_HID to improve code
readability.
Signed-off-by: NHanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/processor_core.c

@@ -390,5 +390,5 @@ void __init acpi_early_processor_set_pdc(void)
 	acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
 			    ACPI_UINT32_MAX,
 			    early_init_pdc, NULL, NULL, NULL);
-	acpi_get_devices("ACPI0007", early_init_pdc, NULL, NULL);
+	acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, early_init_pdc, NULL, NULL);
 }