ARM i.MX boards: use CONFIG_MULTI_IRQ_HANDLER

Also, add handle_irq callbacks to machine descriptors.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
diff --git a/arch/arm/mach-mx5/board-cpuimx51sd.c b/arch/arm/mach-mx5/board-cpuimx51sd.c
index ff096d5..06beec1 100644
--- a/arch/arm/mach-mx5/board-cpuimx51sd.c
+++ b/arch/arm/mach-mx5/board-cpuimx51sd.c
@@ -335,6 +335,7 @@
 	.map_io = mx51_map_io,
 	.init_early = imx51_init_early,
 	.init_irq = mx51_init_irq,
+	.handle_irq = imx51_handle_irq,
 	.timer = &mxc_timer,
 	.init_machine = eukrea_cpuimx51sd_init,
 MACHINE_END