ACPICA: Constify pathname argument for acpi_get_handle()

acpi_get_handle() uses the pathname argument to find a handle related to
that pathname but it does not need to modify it. Make it const, in order
to be able to pass const pathname to it.

Link: https://github.com/acpica/acpica/pull/773Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/acpica/nsxfname.c

@@ -44,7 +44,7 @@ static char *acpi_ns_copy_device_id(struct acpi_pnp_device_id *dest,
 
 acpi_status
 acpi_get_handle(acpi_handle parent,
-		acpi_string pathname, acpi_handle *ret_handle)
+		const char *pathname, acpi_handle *ret_handle)
 {
 	acpi_status status;
 	struct acpi_namespace_node *node = NULL;

include/acpi/acpixf.h

@@ -526,7 +526,7 @@ ACPI_EXTERNAL_RETURN_STATUS(acpi_status
 					   struct acpi_buffer *ret_path_ptr))
 ACPI_EXTERNAL_RETURN_STATUS(acpi_status
 			     acpi_get_handle(acpi_handle parent,
-					     acpi_string pathname,
+					     const char *pathname,
 					     acpi_handle *ret_handle))
 ACPI_EXTERNAL_RETURN_STATUS(acpi_status
 			     acpi_attach_data(acpi_handle object,