Add device driver for a virtual programmable interrupt controller

The virtual PIC is designed as a device tree-based interrupt controller.

The compatible string used by OS for binding the driver is
"google,goldfish-pic".
Signed-off-by: NMiodrag Dinic <miodrag.dinic@mips.com>
Signed-off-by: NGoran Ferenc <goran.ferenc@mips.com>
Signed-off-by: NAleksandar Markovic <aleksandar.markovic@mips.com>
Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>