ARM: omap2plus: convert to CONFIG_MULTI_IRQ_HANDLER

Convert the omap2plus platforms to be using CONFIG_MULTI_IRQ_HANDLER.
Each machine is modified to provide either omap2_intc_handle_irq(),
omap3_intc_handle_irq() or gic_handle_irq().

This allows for a major cleanup, removing the MULTI_OMAP setup
from the interrupt path.

Tested on both Panda and IGEPv2 (single kernel image)

Tested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

arch/arm/mach-omap2/board-omap4panda.c

@@ -31,6 +31,7 @@
 
 #include <mach/hardware.h>
 #include <mach/omap4-common.h>
+#include <asm/hardware/gic.h>
 #include <asm/mach-types.h>
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>
@@ -577,6 +578,7 @@ MACHINE_START(OMAP4_PANDA, "OMAP4 Panda board")
 	.map_io		= omap4_map_io,
 	.init_early	= omap4430_init_early,
 	.init_irq	= gic_init_irq,
+	.handle_irq	= gic_handle_irq,
 	.init_machine	= omap4_panda_init,
 	.timer		= &omap4_timer,
 MACHINE_END