ARM: OMAP2+: Remove hardcoded IRQs and enable SPARSE_IRQ

Remove hardcoded IRQs in irqs.h and related files as these
are no longer needed.

Reviewed-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/mach-omap2/common.h b/arch/arm/mach-omap2/common.h
index 7e60a69..4cdb08c 100644
--- a/arch/arm/mach-omap2/common.h
+++ b/arch/arm/mach-omap2/common.h
@@ -26,12 +26,13 @@
 #define __ARCH_ARM_MACH_OMAP2PLUS_COMMON_H
 #ifndef __ASSEMBLER__
 
+#include <linux/irq.h>
 #include <linux/delay.h>
 #include <linux/i2c/twl.h>
 #include <plat/common.h>
 #include <asm/proc-fns.h>
 
-#define OMAP_INTC_START		0
+#define OMAP_INTC_START		NR_IRQS
 
 #ifdef CONFIG_SOC_OMAP2420
 extern void omap242x_map_common_io(void);