ARM: integrator: register the IM-PD1 VIC

The peripherals on the IM-PD1 has never really been able to
properly fire their IRQs to the main FPGA IRQ controller.
Cascade it properly and register interrupts for all the
devices in the array.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --cc arch/arm/mach-integrator/Kconfig
Simple merge

diff --cc arch/arm/mach-integrator/impd1.c
Simple merge