net: niu uses crc32, so select CRC32

From: Randy Dunlap <randy.dunlap@oracle.com>

niu drivers uses crc32 functions, so it needs to select CRC32.

niu.c:(.text+0x18a7f8): undefined reference to `crc32_le'
Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/Kconfig

@@ -2696,6 +2696,7 @@ config NETXEN_NIC
 config NIU
 	tristate "Sun Neptune 10Gbit Ethernet support"
 	depends on PCI
+	select CRC32
 	help
 	  This enables support for cards based upon Sun's
 	  Neptune chipset.