ARM: mxs: remove mach/irqs.h

With SPARSE_IRQ adopted for mach-mxs, header mach/irqs.h is needed
nowhere now, so remove it.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/mach-mxs/include/mach/irqs.h

-/*
- *  Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
- */
-
-/*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#ifndef __MACH_MXS_IRQS_H__
-#define __MACH_MXS_IRQS_H__
-
-#define MXS_INTERNAL_IRQS	128
-
-#define MXS_GPIO_IRQ_START	MXS_INTERNAL_IRQS
-
-/* the maximum for MXS-based */
-#define MXS_GPIO_IRQS		(32 * 5)
-
-/*
- * The next 16 interrupts are for board specific purposes.  Since
- * the kernel can only run on one machine at a time, we can re-use
- * these.  If you need more, increase MXS_BOARD_IRQS, but keep it
- * within sensible limits.
- */
-#define MXS_BOARD_IRQ_START	(MXS_GPIO_IRQ_START + MXS_GPIO_IRQS)
-#define MXS_BOARD_IRQS		16
-
-#define NR_IRQS			(MXS_BOARD_IRQ_START + MXS_BOARD_IRQS)
-
-#endif /* __MACH_MXS_IRQS_H__ */