drivers/net,AT91RM9200: add missing GENERIC_HARDIRQS dependency

The AT91RM9200 driver call devm_request_irq() and therefore should
depend on GENERIC_HARDIRQS to prevent link/compile errors on plaforms
without GENERIC_HARDIRQS.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

drivers/net/ethernet/cadence/Kconfig

@@ -22,6 +22,7 @@ if NET_CADENCE
 
 config ARM_AT91_ETHER
 	tristate "AT91RM9200 Ethernet support"
+	depends on GENERIC_HARDIRQS
 	select NET_CORE
 	select MACB
 	---help---