thunderbolt: select CRC32 in Kconfig

We use __crc32c_le in ctl.c. So make sure that the dependency is there.

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/thunderbolt/Kconfig b/drivers/thunderbolt/Kconfig
index 5aab79b..c121acc 100644
--- a/drivers/thunderbolt/Kconfig
+++ b/drivers/thunderbolt/Kconfig
@@ -1,6 +1,7 @@
 menuconfig THUNDERBOLT
 	tristate "Thunderbolt support for Apple devices"
 	depends on PCI
+	select CRC32
 	help
 	  Cactus Ridge Thunderbolt Controller driver
 	  This driver is required if you want to hotplug Thunderbolt devices on