Remove GENERIC_HARDIRQ config option

After the last architecture switched to generic hard irqs the config
options HAVE_GENERIC_HARDIRQS & GENERIC_HARDIRQS and the related code
for !CONFIG_GENERIC_HARDIRQS can be removed.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/openrisc/Kconfig

@@ -11,7 +11,6 @@ config OPENRISC
 	select HAVE_MEMBLOCK
 	select ARCH_REQUIRE_GPIOLIB
         select HAVE_ARCH_TRACEHOOK
-	select HAVE_GENERIC_HARDIRQS
 	select GENERIC_IRQ_CHIP
 	select GENERIC_IRQ_PROBE
 	select GENERIC_IRQ_SHOW