irqchip/gic-v2m: Include arm-gic-common.h

W=1 build complains:

drivers/irqchip/irq-gic-v2m.c:570:12: warning: no previous prototype for ‘gicv2m_init’ [-Wmissing-prototypes]
  570 | int __init gicv2m_init(struct fwnode_handle *parent_handle,

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20221121140048.470680255@linutronix.de