ACPICA: Fix deconstification warnings (-Wcast-qual) with acpi_ns_root_initialize().

ACPICA commit 8b3b57c9d11d9c322e09cb06bedac7aa783458fd

Link: https://github.com/acpica/acpica/commit/8b3b57c9
Signed-off-by: Jung-uk Kim <jkim@FreeBSD.org>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/acpica/nsaccess.c

@@ -108,9 +108,9 @@ acpi_status acpi_ns_root_initialize(void)
 		}
 
 		status =
-		    acpi_ns_lookup(NULL, (char *)init_val->name, init_val->type,
-				   ACPI_IMODE_LOAD_PASS2, ACPI_NS_NO_UPSEARCH,
-				   NULL, &new_node);
+		    acpi_ns_lookup(NULL, ACPI_CAST_PTR(char, init_val->name),
+				   init_val->type, ACPI_IMODE_LOAD_PASS2,
+				   ACPI_NS_NO_UPSEARCH, NULL, &new_node);
 		if (ACPI_FAILURE(status)) {
 			ACPI_EXCEPTION((AE_INFO, status,
 					"Could not create predefined name %s",