arm: omap: irq: drop .handle_irq and .init_irq fields

now we can safely drop those fields from our machine_desc.

While at that, also drop the now unused omap_intc_of_init()
definition.

Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --cc arch/arm/mach-omap2/board-generic.c
Simple merge

diff --cc arch/arm/mach-omap2/common.h
Simple merge

diff --cc arch/arm/mach-omap2/irq.c
Simple merge