Renesas ARM Based SoC Cleanup for v4.5

* Remove now unnecessary header
* Introduce ARCH_RENESAS
* Remove unmaintened URL from MAINTAINERS
ARM: shmobile: Remove legacy mach/irqs.h

The header isn't needed anymore now that all SoCs use multiplatform
kernels. Remove it.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
3 files changed