irqchip/renesas-intc-irqpin: Remove obsolete platform data support

Since commit 4baadb9e ("ARM: shmobile: r8a7778: remove obsolete
setup code"), all Renesas SoCs with a renesas-intc-irqpin module are
only supported in generic DT-only ARM multi-platform builds.  The driver
doesn't need to use platform data anymore, hence remove platform data
configuration.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/1448376581-9202-2-git-send-email-geert+renesas@glider.be


Signed-off-by: Jason Cooper <jason@lakedaemon.net>